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Journal Cover Australian Journal of Water Resources
  [SJR: 0.226]   [H-I: 9]   [6 followers]  Follow
   Full-text available via subscription Subscription journal
   ISSN (Print) 1324-1583
   Published by RMIT Publishing Homepage  [400 journals]
  • Volume 19 Issue 1 - Master recession analysis of transmission loss in some
           Australian streams
    • Abstract: Boughton, W
      A new method of constructing a master recession curve from a daily streamflow record is based on averaging recession values in 15 segments of fl ow range. The results from 100 records on the east coast of Australia show substantial variations in baseflow recessions from the simple exponential decay model Qt = Q0kt usually assumed. The difference between the theoretical exponential decay model and the actual baseflow recession is assumed to be due to transmission loss which varied from zero in two streams to a maximum of 0.186 mm/day in the other 98 catchments. The averaging of recession values in segments of fl ow ranges gives a master recession over the whole range of daily flows unlike just baseflow recessions as in previous methods. The new method is coded into a computer program MASTER, which automatically calculates the master recession and the transmission loss. This is much simpler than earlier methods of constructing master recessions. The method of estimating transmission loss relies on identifying a baseflow recession in the master recession and so is not suitable for use on ephemeral streams in arid and semi-arid areas but provides a means of assessing transmission loss in humid zone streams.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 19 Issue 1 - Development of drought severity-duration-frequency
           curves in Victoria, Australia
    • Abstract: Rahmat, SN; Jayasuriya, N; Bhuiyan, M
      One of the many ways in preparing for drought is to carry out a drought risk assessment by characterisation of the frequency, severity and duration of a drought. Therefore, the current study aimed at the development of severity-duration-frequency (SDF) curves to provide a comprehensive characterisation of the droughts for 10 selected stations in Victoria, Australia. The development of the frequency curves is based on the precipitation deficits which were computed based on the Standardised Precipitation Index (SPI). Instead of using SPI values, the precipitation thresholds were used to compute the severity of the droughts. This would be very helpful in delivering information that can be understood easily by ordinary users and decision-makers. The SDF curves were developed using the partial duration series (PDS) technique. Log Pearson Type III distribution was chosen and fitted well to the precipitation deficits for different durations of drought. Overall, SDF curves were successfully derived for 10 stations in Victoria and can provide useful information for medium/long term planning, such as in planning irrigation supply and developing drought relief policies.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 19 Issue 1 - Building walls around flood problems: The place of
           levees in Australian flood management
    • Abstract: Wenger, C
      Recent Australian floods have resulted in many changes to levee provisions in Queensland, Victoria and New South Wales. It is therefore timely to review levee issues and current state arrangements. This paper investigates the use of levees as an adaptation measure to address climate change. It also looks at the performance and reliability of Australian levees, environmental impacts, and the relationship between levees and the development of flood prone land. Despite recent changes, there continues to be much scope for improving floodplain development planning and the assessment and management of levees. Development controls continue to be inadequate and this will fuel future demand for levee protection, while lack of development controls behind levees is likely to lead to greater consequences when levees fail, a scenario more likely due to loss of climate stationarity. While levees provide incremental adaptation, they do not offer a long-term solution. However, transformational adaptation measures used in many places overseas are poorly supported by Australian funding programs. Long-term adjustments need to be planned and funded and appropriate incentives and decision-making structures need to be put in place.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 19 Issue 1 - David Herbert Pilgrim AM (1931-2015)
    • PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 19 Issue 1 - Preface
    • Abstract: Phillips, Brett C
      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 19 Issue 1 - Discussion on "Time-varying character of storm
           intensity frequency and duration curves" by AG Yilmaz, H Safaet, F Huang
           and BJC Perera
    • Abstract: French, R; Jones, M
      Readers of Yilmaz et al's (2014) paper would find it rewarding to first read Westra et al's (2010) paper on climatic non-stationarity, which brings together much research and offers guidance on the subject. For instance, they said "robust statistical results are best obtained by examining annual and seasonal rainfall ... [so] research emphasis also has been on trends in daily or longer timescales, rather than the sub-daily storm bursts", thereby leaving a research gap which Yilmaz et al seek to fill according to their words: "As climate changes, the main changes in precipitation will potentially be in the intensity, frequency, and duration of events".

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 19 Issue 1 - Discussion on "Influence of roofing materials and lead
           flashing on rainwater tank contamination by metals" by MI Magyar, AR
           Ladson, C Daiper and VG Mitchell
    • Abstract: Coombes, PJ
      Investigations by the writer established that the quality of rainwater collected from roofs at Figtree Place and nearby houses in Newcastle occasionally exceeded the values from Australian drinking water guidelines for ammonia, pH and lead (Coombes et al, 2000; Coombes, 2002). However, no exceedances of the guidelines were observed for chemical and metal parameters including Lead in the water column of the storages or at hot water taps. This discovery suggested that rainwater quality in storages improves because metal and chemical contaminants settle to the bottom of the tanks where they sorb to a biofi lm that is commonly known as sludge. Samples taken from the sludge revealed accumulation of lead (0.033 mg/L) and iron (0.93 mg/L). This led to the hypothesis that the water treatment processes of flocculation, settlement, sorption and bio-reaction operate in rainwater storages to improve quality of stored rainwater. Rainwater storages are bioreactors with biofilms at the water surface micro layer, on internal walls and at the bottom as sludge. An important insight was that rainwater should not be drawn from the bottom 100 mm of a rainwater tank to maximise the quality of water by avoiding disturbance of the sludge. Field observations and laboratory experiments revealed that a first flush device designed to capture the first 0.25 mm of roof runoff can remove 11% to 94% of dissolved solids and 62% to 97% of suspended solids from the first flush of runoff into a rainwater tank which would limit the infl ow of chemicals and metals to stored rainwater.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 19 Issue 1 - Direct rainfall flood modelling: The good, the bad and
           the ugly
    • Abstract: Hall, J
      The direct rainfall method (DRM) for flood modelling involves the application of rainfall to all cells in a 2D model, and runoff is routed within the hydraulic model. Advantages of this approach include the facilitation of cross catchment flows, a high definition of flow behaviour in catchments, and the approach can replace the requirement for hydrological models within the 2D model domain. Complications can occur when applying the DRM which can lead to unrealistic fl ow responses and large model errors. Issues are generally associated with model losses, run-times, grid-scale effects and very shallow flow. The DRM was used to develop a flood model in the Serpentine area on the sandy Swan Coastal Plain in southwest Western Australia (approximately 20 km south of Perth). The project demonstrates the suitability of the DRM for design flood simulations and floodplain mapping. Due to the problems associated with the approach, a series of checks and quality assurance procedures are recommended if DRM flood modelling is undertaken. This paper explores the pros and cons of the DRM through the processes of model construction, a comprehensive model calibration, validation and sensitivity analysis, and a series of checks including mass balances, and comparison to traditional modelling techniques.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 19 Issue 1 - A numerical investigation of flow over a side weir
           based on the experimental data
    • Abstract: Namaee, MR
      Side weirs are one of the most important and sensitive parts of flood water spreading systems. Their inappropriate or incorrect function can potentially have an adverse effect on the entire system, making it difficult for flood water spreading systems to perform correctly. Hence, it is necessary to study the hydraulic behaviour of the side weirs. One of the applications of side weirs is predicting the accurate flow measurement in irrigation and floodwater spreading systems. In this study, flow over a broad-crested side weir is numerically investigated based on experimental data under sub-critical condition. The numerical model considers flow over a side weir using Reynolds's Average Navier-Stokes (RANS) equations. The standard k-epsilon turbulence is used to account for turbulence modelling and the volume of fluid scheme was also used in the model to find the free surface of flow. The simulation results are validated by experimental data. They provide detailed analysis of flow patterns, longitudinal pressure distributions over the side weir and also outflow discharge. This study shows that existing numerical models using RANS are applicable in the design of side weirs.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 19 Issue 1 - Change in in-stream salinity from interception of
           saline groundwater discharge into the Lower River Murray, Australia
    • Abstract: Meissner, AP
      Salt accessions are the major water quality issue of the rivers and streams of the Murray-Darling Basin. The saline Murray Group Aquifer, the salinity of which exceeds 20,000 muS/cm, discharges an estimated 200 t/d of salt into the River Murray in South Australia between Lock 3 and Holder, 40 km downstream. Salinity mitigation works were needed to sustain irrigated agriculture and to maintain the quality of domestic, industrial and urban water supplies. Forty nine wells were drilled to the aquifer between Lock 3 and Holder from late 1989 to August 1990. Pumping of saline groundwater commenced in 1990 to lower the groundwater gradient to the river to zero thus preventing saline water discharging into the river. Telfer and Way estimated that pumping from the aquifer lowered salinity in the river stream by 46.3 muS/cm. Regression analysis of data that restricted it to three years prior to full pumping commenced and to 3 years after zero gradient was achieved, with sites as categorical variables, estimated a reduction of 58.4+/-9.4 muS/ cm for flows
      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 19 Issue 1 - Instructions to authors submitting to engineers
           Australia technical journals
    • PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 18 Issue 1 - Time-varying character of storm intensity frequency
           and duration curves
    • Abstract: Yilmaz, AG; Safaet, H; Huang, F; Perera, BJC
      Recent climate change impact studies suggest that current rainfall intensity-frequency-duration (IFD) curves are likely to change as a result of climate change. In this paper, an effort was made to quantify the changing character of storm IFD curves using data of four consecutive 30-year time slices from 1880 to 2010. The Melbourne Regional Office rainfall data were used for the purposes of the study. Annual maximum series and generalised extreme value distribution were employed to derive the IFD curves using the data of different time slices and the whole period. Results of IFD curves produced from data for the whole period and the current IFD procedure in Australia, described in Australian Rainfall and Runoff (ARR), showed that the former had produced higher intensities for all sub-hourly storms of return periods of 10 to 100 years compared to the latter, and vice versa for return periods below 10 years. For all other storm durations (ie. 1-72 hours) and for short return periods (
      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 18 Issue 1 - Planning for success in a climate change future:
           Collaborative water governance in the Upper Murrumbidgee Catchment,
           Southeastern Australia
    • Abstract: Benham, C; Hussey, K; Beavis, S
      Collaboration between stakeholders plays an important role in natural resource management (NRM). It is particularly key to managing water resources, which often cross jurisdictional boundaries and are typically managed by multiple stakeholders. The role of social capital in making NRM collaborations successful has also been recognised. In this paper, we explore the development of social capital in NRM governance networks through an analysis of the Actions for Clean Water (ACWA) project, a collaborative NRM planning process in the Upper Murrumbidgee Catchment, southeastern Australia. We argue that the success of collaborative processes like ACWA is related to the strength of linkages between stakeholders, and the stocks of social capital that these linkages contribute to. We further suggest that collaborative processes can stimulate linkages between participating organisations, paving the way for further collaboration and facilitating the integrated management of water resources. However, their ability to do so is strongly influenced by the geographical, historical, institutional, political and economic contexts in which they are embedded. These contextual factors must be taken into account if natural resource managers are to design collaborative processes that can strengthen governance networks and improve water resource management outcomes in a climate change future.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 18 Issue 1 - Preface
    • Abstract: Phillips, Brett C
      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 18 Issue 1 - Discussion on "Application of empirical scale
           correction factors with regional flood prediction equations: A case study
           for Eastern Australia" by MA Zaman, K Haddad and A Rahman
    • Abstract: French, R; Jones, M
      Moves to replace the Rational Method as a flood design method - whether in its deterministic or probabilistic manifestation - were first evident in 'Australian Rainfall and Runoff' (Pilgrim, 1987) in which the southern and western states had moved to regional flood frequency (RFF) procedures. The forthcoming edition of 'Australian Rainfall and Runoff' is expected to adopt RFF procedures in some form for the whole of Australia (Rahman et al, 2012).

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 18 Issue 1 - Abstracts
    • PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 18 Issue 1 - Visual attractiveness versus water conservation in
           front yard preferences in the context of drought in Melbourne, Australia
    • Abstract: Chui, SCK
      In the recent drought from 1997 to 2010, prolonged water restrictions on outdoor water-use damaged urban and suburban vegetation in Melbourne, Australia. Australia is prone to recurring droughts due to the El Nino Southern Oscillation, and these droughts are predicted to become more frequent and more severe in the coming decades due to climate change. To explore the attitudes of Melbourne residents towards water conservation in household front yards, a survey was conducted in which respondents were presented with six front yard designs and asked to assess each one according to a range of criteria. It was found that the overall desirability of each front yard was not correlated with their water-use requirements, but rather it was most strongly correlated with their rated visual attractiveness. Therefore, it is recommended that any attempts to promote drought-resistant landscaping should give due consideration to the visual attractiveness of the proposed landscaping options.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 18 Issue 1 - Influence of roofing materials and lead flashing on
           rainwater tank contamination by metals
    • Abstract: Magyar, MI; Ladson, AR; Diaper, C; Mitchell, VG
      The quality of rainwater collected in polyvinyl chloride (PVC) tanks from six trial roofs (glazed tile, pre-painted steel and aluminium-zinc coated steel, each with and without uncoated lead flashing) was monitored for nine months. Samples of water and sediment were collected at three monthly intervals and analysed for concentrations of metals (Al, Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn), in order to determine the influence of roof materials and uncoated lead (Pb) flashing upon metal contamination within the tanks. Lead concentration in tank water exceeded Australian Drinking Water Guidelines for all roof types where there was lead flashing. Lead flashing also contributed to contamination of tank sediments. In all cases, pH was low which contributed to a large proportion of lead being in the dissolved form.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 18 Issue 1 - Quantitative measure of salt interception using
           in-river transient electromagnetic geophysics
    • Abstract: Bekesi, G; Telfer, A; Woods, J; Forward, P; Burnell, R; Hatch, M
      In the lower Murray-Darling Basin, most groundwater discharges to the floodplain of the River Murray. Most of the groundwater is of high salinity and therefore can transfer significant salt loads into the river. To mitigate saline groundwater intrusion into the river, salt interception schemes (SIS) have been commissioned since the early 1990s. The SIS intercept highsalinity groundwater flow adjacent to the river floodplain and the intercepted water is pumped to distant evaporation basins. The in-river transient electromagnetic (RTEM) geophysics technique can be used to infer saline groundwater discharge areas and to inform SIS locations. RTEM results have also been used, albeit qualitatively, in the monitoring and evaluation of the performance of SIS. A methodology for evaluating SIS performance has been developed based on the area above the cumulative frequency distribution (ACFD) of RTEM riverbed-only resistivities. In addition to RTEM maps and cross-sections, the ACFD characterises a river reach with a single number. Increases in ACFD, from pre- to post-SIS RTEM surveys, indicate the changing groundwater flow regime and the building of freshwater lenses.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 18 Issue 1 - Evidence to support the significance of rapid lateral
           flow contributions from a subsurface palaeochannel to a stream during
           event flows
    • Abstract: Summerell, G; Grayson, R; Muller, R; Walker, G; Shoemark, V
      Debate over water movement processes and pathway contributions through the landscape into streams remains contested, as often paradox evidence between published studies demonstrate major differences in reported component contributions. The objectives of this paper are to add further evidence to this ongoing debate through using multidisciplinary field-based measurement techniques and a focus around the impact of ancient palaeochannels for directing significant contributions of soil water and solutes into streams in relatively short and reactive time frames during stream flow events. The project involved a field-based study in the Livingstone Creek subcatchment located within the Murrumbidgee valley of inland southern New South Wales, where dryland salinity problems are of major concern. The project investigates the processes influencing salt movement from the landscape to the stream in a upland catchment that also has large areas of river flats and valleys. The major finding of the study was that during rainfall events rapid infiltration of recharge occurred in the unsaturated zones across the alluvial landform.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 18 Issue 1 - Assessment of baseflow seasonality and application to
           design flood events in southwest Western Australia
    • Abstract: Kinkela, K; Pearce, LJ
      Design flood events are strongly influenced by seasonality in southwest Western Australia (WA). This region is also known to be dominated by potentially high baseflow contributions during large floods. The proportion of baseflow to use in design has limited understanding, especially in the large to extreme flood range. Australian Rainfall and Runoff Update Project 7 used an adapted version of the Lyne and Hollick (1979) baseflow separation method to develop prediction equations that estimate baseflow contributions for annual design floods. This study found that the Lyne and Hollick separation technique was not applicable to all sites in southwest WA. Instead a manual graphical separation technique was adopted which provided more representative baseflow separations. Catchment specific and regional seasonal trends were derived and upper envelope curves were adopted for regional design estimates to ensure baseflow contribution was not underestimated. In the Darling Scarp region the recommended baseflow proportion to the total flood peak for rare to extreme design floods is 4% in summer and 11% in winter. The highly variable nature of baseflow response suggests that, where possible, at-site gauged data should be analysed to assess design baseflow contribution.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 18 Issue 2 - Preface
    • Abstract: Phillips, Brett C
      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 18 Issue 2 - Scour at various hydraulic structures: Sluice gates,
           submerged bridges and low weirs
    • Abstract: Melville, BW
      Prediction of likely scour depths is an important aspect of the design of hydraulic structures. While detailed guidance is available for the scour design of some structures, eg. bridge foundations, scant information is available for many other structures. Recent, as yet unpublished, research findings for a number of fluvial structure types are presented herein. The research findings span scour downstream from sluice gates, scour in the vicinity of low weirs, together with a particular aspect of scour at bridge foundations that has previously received minimal attention. In each case, new data are presented, together with analyses of the data and simple (preliminary) design relationships are determined from the data. A feature common to bridges and low weirs is the form of the dependence of scour depth on flow intensity for clear-water and live-bed scour conditions. The new data are derived from small-scale laboratory experiments for non-cohesive (alluvial) bed materials; the research findings are limited accordingly.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 18 Issue 2 - Decision making roles and responsibility for
           environmental water in the Murray-Darling Basin
    • Abstract: Horne, A; O'Donnell, E
      The current debate around environmental water in the Murray-Darling Basin has focused on how much water the environment needs (what should the sustainable diversion limits be) and how this water should be recovered. Now that the Murray-Darling Basin Plan has set these targets, discussion will quickly move to implementation and the governance arrangements for this water; that is, what parties are involved, what are their responsibilities, how are they accountable and how do they interact' While the agencies involved in environmental water management and their respective roles are broadly understood, the detail around accountability, interaction between agencies and assessment of success has potential for improvement. Massive public expenditure in water recovery and management requires high levels of accountability, and in such high stakes conditions, confusion can breed mistrust. This paper documents agency roles and existing governance models and proposes features of a governance model for environmental water management to enhance accountability, trust and efficiency.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 18 Issue 2 - Modelling the local ecological outcomes of basin scale
           water planning
    • Abstract: Wen, L; Rogers, K; Saintilan, N
      In 2011, the Australian government proposed the Murray-Darling Basin Plan to promote a healthy working river system. The proposed Plan seeks to limit surface water (consumptive) use to 10873 GL/year on a long-term average. The controversy prompted by this proposed reduction in extractive allocations has underscored the need for transparent and objective modelling of ecological benefits. In this paper, we investigate the likely ecological outcomes of the proposed plan for the Macquarie Marshes, a Ramsar-listed wetland in the Murray-Darling Basin, using a decision support system (DSS). The DSS uses a detailed wetland hydrological model to drive ecological responses for a range of important species. Our hydrological modelling results indicate that the proposed plan would increase inundation extent significantly with a 33% increase for the median when compared with the current water sharing plan. The increase in inundation extent would improve the hydrologic condition in most wetlands. Our ecological modelling results show that the improved hydrology would enhance the wetland quality for a range of vegetation and water-bird species, although benefits are not distributed evenly across the wetlands. For a number of species, some wetlands within the marshes have habitat quality scores matching the predevelopment scenario and benefits of additional environmental water allocation were noticeable when modelled for a prolonged drought period.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 18 Issue 2 - The importance of estimating stock and domestic water
           use in the context of a water constrained future: Lessons from the Woori
           Yallock catchment, Victoria
    • Abstract: Larsen, C; Wallis, D; Toulmin, M; Gaskill, S
      Managing competing needs in water resource planning will become increasingly important due to the impacts of climate change on water availability. A holistic management approach is required to ensure sustainable and equitable allocation between consumptive and environmental water needs. While consumptive licences are currently metered in Victoria, there is little data about stock and domestic usage and its associated impact on streamflow. This project aimed to estimate the use of stock and domestic water in the Woori Yallock catchment from waterways, groundwater and dams. The project gathered data that will improve the confidence of hydrological modelling underpinning stream fl ow management planning in and around Melbourne.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 18 Issue 2 - The effect of stream network simplification and gauge
           error on river model performance
    • Abstract: Hughes, JD; Dutta, D; Vaze, J; Podger, GM; Kim, SSH
      Recent development of a Simplified Murray-Darling Basin Model along with an auto-calibration capacity has advanced the ability to rapidly conceptualise and parameterise river system models. However in any process of conceptualisation, some simplification may be warranted or desirable. In some cases the exact nature of stream connection in an anastomosing river network is difficult to determine. To more thoroughly assess the effect of simplification or error in stream network conceptualisation a range of river network conceptual models were assessed, ranging from as complex as the gauging network permits, to a simple single reach. Model performance is assessed by agreement with observed stream gauge data at various points for separate calibration and evaluation periods. The Lachlan catchment in central NSW was used as the test basin for this study. Results show that simplification can result in similar goodness of fit to less simple conceptual models. Care must be taken to avoid inclusion of gauges that increase model error in some downstream gauges. Errors in gauge data are propagated to downstream reaches, but the nature of the errors will determine how far the error persists as calibration moves further downstream. Flow based errors (eg. gauge rating error) and high frequency errors tend to become less detectable at more distant downstream gauges.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 18 Issue 2 - Numerical modelling of the hydrodynamics and total
           dissolved gas downstream of Hells Canyon Dam
    • Abstract: Politano, M; Amado, AArenas; Anderson, K
      A computational fluid dynamics model was developed to predict the fl ow pattern and total dissolved gas (TDG) distribution downstream of Hells Canyon Dam on the border of Idaho and Oregon, USA. Free surface simulations in the tailrace were carried out to predict spillway jet regimes with and without deflectors. Model results agreed with deflector performance curves obtained in a 1:48 laboratory scale model. The distribution of TDG was predicted with a mixture model that accounts for the two-phase fl ow in the tailrace and the mass transfer between bubbles and water. Attenuation of the turbulence at the free-surface and the effect of the bubbles on the turbulence was included to capture water attraction towards spillway surface jets, which affects the amount of water exposed to bubbles and downstream TDG dilution. The model takes into account changes in bubble size with dissolution and pressure. Good agreement was obtained between predicted TDG and available measurements in the field.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 18 Issue 2 - Blockage effects on scouring downstream of box
           culverts under unsteady flow
    • Abstract: Sorourian, S; Keshavarzi, A; Ball, J; Samali, B
      This experimental study is concerning scouring at the outlet of partially blocked box culverts under unsteady flow condition. The blockage of culverts is considered as an important factor on the scouring pattern at the outlet of the blocked box culverts. To investigate the effect of blockage on scouring pattern downstream of a box culvert under unsteady flow, some experimental tests were carried out in a laboratory flume located in the Hydraulics Laboratory of the University of Technology Sydney. The experimental tests were carried on in both partially blocked and non-blocked conditions and consequentially the effect of blockage on scour pattern is investigated. It was found that 88% to 98% of maximum scour depth occurs in the rising limb of the hydrograph.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 18 Issue 2 - Instructions to authors submitting to engineers
           Australia technical journals
    • PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 18 Issue 2 - Abstracts
    • PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 17 Issue 2 - Below the double bottom line: The challenge of
           socially sustainable urban water strategies
    • Abstract: Sofoulis, Z
      Recent interview-based research on how Australian urban water professionals grasp the social aspects of sustainable water management suggests that interest in these dimensions outstrips understanding of them, and that more culturally intelligent, socially realistic and ethically sensitive notions of people, culture and society are needed. Despite lip-service to 'triple bottom line' assessments of policies and developments, Australia's policymakers have advanced no further than a 'double bottom line' based on economic and environmental values, the latter preferably expressed in dollar terms. The economic (or market relation) also substitutes for the social dimension in a continued policy emphasis on customers rather than citizens or community members. An overemphasis on behavioural economics, a lack of social, political and cultural theory, and neglect of people's actual practices means that much policy and research around water fails to grapple with such basic social elements as gender, different roles and access to resources within households, cultural diversity, or ethical orientations. A major challenge is to mobilise rather than ignore the altruistic and socially-oriented human capacities for adapting to change beyond the customer relation or the confines of technical and economic rationality; including by collective innovations in values and practices of caring for water.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 17 Issue 2 - Systematic causal inference and knowledge transfer
           between science and policy: Eco Evidence in water management
    • Abstract: Skinner, DS; Webb, JA; Nichols, SJ; Stewardson, MJ
      Effectively transferring complex scientific ideas into the policy domain is a serious challenge, but an essential one given the important role of science in assessing the implications of a changing climate and resulting water shortages in Australia. Eco Evidence, a method for conducting systematic reviews of the scientific literature using causal criteria analysis, was developed for the eWater Cooperative Research Centre to help bridge this gap between science and policy. It provides a transparent and repeatable method for assessing the strength of the available scientific evidence regarding particular management actions. However, if evidence is used to justify decisions rather than to provide options and likely outcomes of these options to stakeholders, its effectiveness can be undermined. By drawing on interdisciplinary theories of uncertainty in the science-policy arena, this paper demonstrates how Eco Evidence can be used in evidence-based practice in a manner that does not interfere with the effective participation of a range of stakeholders in the decision-making process.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 17 Issue 2 - Understanding the vulnerability, resilience and
           adaptive capacity of households in rural Victorian towns in the context of
           long-term water insecurity
    • Abstract: Stebbing, MS; Carey, M; Sinclair, M; Sim, M
      While the range of impacts of a changing climate on farming communities has been extensively studied in Australia, little is known about how individuals and households in small rural towns adapt to the effects of long-term water insecurity. The health and wellbeing impacts of climate variability may be experienced as direct or indirect health impacts or as reduced access to health and other services as reduced economic viability affects rural towns. Identifying risk factors for vulnerability and local measures and practices that will reduce health and wellbeing impacts offers evidence for climate change adaptation policy direction at the local, state and national level. This paper discusses the results of a study that aimed to improve understanding of the vulnerability, resilience and adaptive capacity of rural communities at the household scale. Focus groups with town residents and key informant interviews were conducted in three rural towns in Western Victoria experiencing differing water security challenges during a period of 'drought'. Perceived health and wellbeing impacts and the differing ways in which residents adapted their lives to accommodate these changes were explored. The study revealed a range of physical, mental, oral health and food security impacts on health and wellbeing. There were clear gender differences in the ways that men and women identified, communicated and dealt with these impacts. Perceived water quality and cost were shown to be key determinants of acceptance of the small town reticulated water supply. The results of this study suggest that a history of conservatism, degree of community connectedness and communication, the small town ethic of self-reliance, and the openness of government to community involvement in decision making, planning and action around water supplies are important factors in determining resilience to threats to water security in small rural towns.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 17 Issue 2 - Climate change adaptation of urban water management
           systems in the wet/dry tropics
    • Abstract: Saunders, NJ; Peirson, WL
      Climate change impacts in the wet/dry tropics are expected to include an increase in extreme daily rainfall events, mean evaporation rates and mean temperatures. The proposed Weddell development, located 40 km south of Darwin, is forecast to have up to 10,500 residents by 2021. This increasing population coupled with projected climate change impacts will increase demand for potable water and exacerbate existing problems associated with the region's wastewater treatment infrastructure. Water sensitive urban design (WSUD) provides an effective method of improving discharge water quality, providing water storage capacity and achieving peak fl ow attenuation. Using the Weddell development as a point of reference this study has shown that WSUD designs implemented in sub-tropical and temperate areas are not directly transposable to the wet/dry tropics. WSUD designs need to be adapted to cope with the extended dry period characteristic of the wet/dry tropics. While WSUD elements could constitute effective adaptation measures in the wet/dry tropics, there is a definite need for long-term studies that assess the practicality of maintaining functioning WSUD elements in the region. In this contribution we discuss the key issues associated with WSUD in the Northern Territory and the outcomes of a consultation workshop with government agencies.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 17 Issue 2 - Energy sector transformation: Implications for water
    • Abstract: Hussey, K; Carter, N; Reinhardt, W
      The energy sector is undergoing major transformation. An under-recognised aspect of this transformation is the implications it has for the availability and quality of our freshwater water resources. Indeed, population growth combined with climate change and associated policies to address it, pose significant challenges for how we use our precious water resources, and the energy sector is set to become an increasingly important 'user' of water in the decades to come. However, despite the important links, and parallels, between the two sectors, the two commodities are perceived, governed and managed in markedly different ways. This paper explores four aspects of the energy sector's transformation that pose particular challenges for water governance.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 17 Issue 2 - Climate change adaptation in the Murray-Darling Basin:
           Reducing resilience of wetlands with engineering
    • Abstract: Pittock, J; Finlayson, C M
      Conflict over water allocations and the need to adapt to climate change in Australia's Murray-Darling Basin has resulted in decision makers choosing engineering interventions to use water more efficiently for wetlands conservation. We review a range of policy and infrastructure adaptation measures implemented in the Basin by governments. The water supply and demand 'environmental works and measures' adopted in the Coorong and Lower Lakes region, as well as along the River Murray, are assessed and compared with the opportunity costs for ecosystem-based adaptation. The results suggest that risks of disruption to ecological processes, desiccation of wetland areas and institutional failure with infrastructure-led adaptation measures are little appreciated. Further, ecosystem-based measures to maintain a more diverse range of ecological processes that would spread risk and conserve a more diverse range of biota have not been identified or adopted by governments. We conclude that as a primary adaptation to climate change environmental works and measures may represent overly-narrow or mal-adaptation that can reduce the resilience of wetland ecosystems.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 17 Issue 2 - Disposable infrastructure including relocatable
           buildings: Adapting to climate change
    • Abstract: Gordon, AD
      In Australia most coastal villages, towns and suburbs started as camping areas, fishing shacks and/or holiday houses, all with basic, self-contained infrastructure. As the intensity of development increased, so did the demand for more conventional 'permanent' infrastructure. The assumption behind this evolution was that the properties the infrastructure was servicing were going to exist for a long time into the future. Shoreline recession due to sediment imbalances, but more recently also associated with the likely impacts of climate change, places permanent styled coastal development and infrastructure at risk. The problem of managing such a situation is exacerbated by the still poorly defined climate future and hence the uncertainty as to when the infrastructure, and the development it serves, will be impacted. Given this uncertainty, a novel way of approaching the problem is to accept the potentially temporary nature of the real estate and hence adopt an adaptive philosophy of disposable infrastructure and relocatable buildings. The challenge is to provide an acceptable standard of building and infrastructure in areas that may come under threat in the future, and to facilitate the implementation of progressive withdrawal as shoreline recession occurs. This calls for an innovative approach to infrastructure and building design.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 17 Issue 2 - Drought severity estimation under a changing climate
    • Abstract: Tan, KS; Rhodes, BG
      This paper describes an approach to estimate drought severity for drought response planning and urban water management considering the impacts of climate change and variability. Low flow frequency analysis was used to estimate drought severity (eg. 1-in-100-year average recurrence interval) of different drought durations from several months to years. Traditionally this was done using available historical streamflow record. However, recent research including the South Eastern Australian Climate Initiative has indicated that the prolonged drought experienced in southeastern Australia including Melbourne in the recent decade since 1997 has been unprecedented in historical context, and is potentially part of a long-term trend associated with global warming. This raises the issue of the practicality of the assumption of hydrologic stationarity. To account for the potential for more severe and frequent drought events, an adaptive approach is needed to adapt to the drier future in a changing and variable climate by considering experience from the recent 1997-2009 drought and the latest climate change projections. In this paper, drought severity for the Melbourne system is estimated based on historical streamflow data with monthly flow prior to 1997 adjusted using a flow duration curve decile method to reflect the recent dry conditions of 1997-2009. The approach is consistent with recommendations in the Victorian 'Guidelines for the Development of a Water Supply-Demand Strategy' (DSE, 2011). The results indicate that drought severity and frequency increased by an order of magnitude under a changed climate based on a 'return to dry' scenario. This shift in severity and frequency highlights the need for adaptive planning methods to address changes in hydrologic conditions under a variable and changing climate. However, it also raises many challenges for drought planning including uncertainties in climate change projections, attribution of recent drought to climate change and variability, and the appropriate hydro-climate baseline for applying climate change projections.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 17 Issue 2 - Provision of usable projections of future water
           availability for southeastern Australia: The South Eastern Australian
           Climate Initiative
    • Abstract: Post, DA; Moran, RJ
      Projections of future water availability are required by water managers and policy makers in order to take action to mitigate some of the potentially negative impacts of climate change on water supplies in the urban, agricultural and environmental sectors. However, in order to do this, these projections must have some level of confidence associated with them, and even if this is the case, the research community must make the data and/or information available in a format that is directly usable by water managers and policy makers. This paper presents results from a water availability study recently carried out across southeastern Australia as part of the South Eastern Australian Climate Initiative. More importantly, it shows how the results of this study have been used in defining a range of plausible future streamflow scenarios to be used by water resource managers in the state of Victoria in updating its water supply-demand strategies for the next 50 years. Climate change projections for this region were summarised by creating 'dry', 'wet' and 'median' future runoff scenarios for 2030 and 2060 based on the second driest, second wettest and median global climate model (GCM) results. These results were then averaged across 27 catchments covering the state of Victoria. We contend that in areas such as the state of Victoria where there is near-unanimous agreement among GCMs as to the direction of climate change impacts on rainfall, along with theoretical understanding consistent with changes in large scale circulation in a warmer world, projected changes in water availability can be used by water resource planners to assist them in better planning for future changes in supply.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 17 Issue 2 - The importance of understanding drivers of
           hydroclimatic variability for robust flood risk planning in the coastal
    • Abstract: Kiem, AS; Verdon-Kidd, DC
      Previous work has established that the risk of climate related emergencies (eg. floods, droughts, bushfires, etc.) in Australia, and many other parts of the world, is non-stationary. That is, the chance of an extreme climatic event occurring is not the same from one year to the next and is in fact dependent on the state of the various ocean-atmospheric phenomena that are responsible for Australia's hydroclimatic variability. This previous work demonstrated how, on average for New South Wales, the probability of a flood occurring that is equal in magnitude to the 1-in-100 year flood is about five times greater during La Nina events compared to all other years and 12 times greater during a La Nina event that occurs during the negative phase of the Inter-decadal Pacific Oscillation compared to all other years. This work has recently been extended to focus specifically on urban coastal areas where it has been found that the non-stationarity of flood risk is even further enhanced when compared to the non-coastal catchments. Also investigated is whether this non-stationarity of flood risk is due to non-stationarity of antecedent conditions or non-stationarity of extreme daily and sub-daily rainfall events, with the finding being that both are important. This is contrary to recent studies that claim there is no evidence of non-stationarity in extreme daily and sub-daily rainfall across Australia. The implications of these results are significant given the large populations and infrastructure investment along the eastern seaboard and also timely given current updates to Engineers Australia's 'Australian Rainfall and Runoff: A Guide to Flood Estimation', the standard for flood estimation in Australia.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 17 Issue 2 - Practical responses to water and climate policy
           implementation challenges
    • Abstract: Daniell, KA
      Water and climate are two of the most important public policy challenges facing Australia. They have pervasive impacts on how and where people can live and what they are likely to be able to do in the future. Policy implementation in these areas suffers from a range of challenges, including how to improve horizon scanning and preparedness, learn from past policy experiences, deal with policy interdependencies, and develop forms of more citizen-centric policy. When these challenges are responded to effectively, it can lead to enhanced foresight and planning, better understanding and communication of policy complexity, and communication of uncertainty and ambiguity, that are key to effective policy implementation. In this context, this paper presents and analyses a number of practical responses to water and climate policy implementation challenges, including the development of 'low regret' policy and infrastructure options that encourage flexibility in responding to possible futures. It also highlights the important role that collaboratively acting now across sectors, issues, governance levels and groups of stakeholders to plan for a range of future scenarios can have on enhancing the capacity of all involved and building pathways to more sustainable and resilient futures.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 17 Issue 2 - Abstracts
    • PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 17 Issue 2 - Instructions to authors submitting to Engineers
           Australia technical journals
    • PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 17 Issue 1 - Instructions to authors submitting to Engineers
           Australia technical journals
    • PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 17 Issue 1 - Abstracts
    • PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 17 Issue 1 - Discussion on 'Design flood estimation in Western
           Australia' by D Flavell
    • Abstract: French, R
      Review(s) of: 'Design flood estimation in Western Australia' by D Flavell. Original paper published in 'Australian Journal of Water Resources', Vol. 16, No. 1, pp. 1-20.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 17 Issue 1 - Reducing flood risk associated with basement drainage
    • Abstract: Ladson, AR; Tilleard, J
      Basements in residential buildings are often subject to flooding. It is common practice to connect basement drainage by gravity to the stormwater system which means that if there is any surcharge caused by capacity constraint, constriction, blockage or partial blockage in the system downstream of where the basement drain connects then the basement is at risk of flooding. This surcharge can lead to water backing up in the drainage pipe and entering the basement. In this discussion paper we comment on flood risk from basement drainage, outline the current guidance and review possible safe drainage solutions.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 17 Issue 1 - Impact of dense reservoir networks on water resources
           in semiarid environments
    • Abstract: de Araujo, JC; Medeiros, PHA
      The northeast of Brazil is a semiarid region where water scarcity is a major problem dealt with by the construction of dams. This policy generated a dense reservoir network in the region, resulting in a complex system. The impacts of the network have been assessed, and the results showed that the existence of a large number of small dams upstream the strategic ones, impact both negatively and positively the overall water availability. The negative effects of the network are mainly high evaporation losses from small reservoirs, and the fact that they add considerable complexity to the management of the system. On the other hand, the reservoirs generate a more democratic water distribution and higher energy rationality, as a consequence of the better spatial distribution of the water resources. In addition, sediment retention in the network leads to lower silting rate of strategic reservoirs, meaning lower temporal decay in water availability in the already water-scarce region.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 17 Issue 1 - Applicability of artificial neural network in
           hydraulic experiments using a new sewer overflow screening device
    • Abstract: Aziz, MA; Imteaz, M; Choudhury, TA; Phillips, D
      During wet weather conditions, sewer overflows to receiving water bodies raise serious environmental, aesthetic and public health problems. These issues trigger the need the most appropriate device/system for a particular installation, especially at unmanned remote locations. A new sewer overflow device consists of a rectangular tank and a sharp crested weir with a series of vertical combs is presented. A series of laboratory tests to determine trapping efficiencies for common sewer solids were conducted for different flow conditions, number of combs layers and spacing of combs. To overcome physical limitations inherent in laboratory studies such as significant cost and time. Artificial neural model was adopted as it has the capacity to accurately predict the outcome of complex, non-linear physical systems with relatively poorly understood physicochemical processes. A series of laboratory tests were conducted with 55 different sets of data. Forty-seven sets of experimental data are used with 60% for training, 20% each for testing and validation of the model. A separate validation data sets were used to judge the overall performance of the trained network. The model can successfully predict the experimental results with more than 90% accuracy with an average absolute percentage error of around 7%.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 17 Issue 1 - Barriers to voluntary improvement of residential
           fertiliser practices in the Peel-Harvey catchment
    • Abstract: Beckwith, J A; Clement, S
      The adoption of best practices in residential lawn and garden fertiliser use has been identified as a cost effective means to reduce urban nutrient inputs to waterways. This article examines the barriers to such voluntary change in urban sub-catchments of the Peel-Harvey Estuary system in Western Australia. The implications for the design and successful implementation of a voluntary community-based behavioural change program targeting residential fertiliser practices are discussed.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 17 Issue 1 - Value-driven river management: A Murray River case
    • Abstract: Bean, NG; Jewell, ND
      This paper outlines a quasi-economic hydrological model and management paradigm geared toward public and not-for-profit regulatory bodies, with particular reference to the southern Murray-Darling Basin in southeast Australia. This value-oriented model and paradigm bridges the gap between short-range hydrological forecasting and long-range economic planning. Decision-making is assisted by a scenario-based methodology with a clear distinction between baseline and marginal quantities. The paradigm has applications to seasonal planning, commercial water trading, environmental stewardship and structural adjustment. Specific applications to the Murray-Darling Basin include (i) evaluation of options for infrastructure upgrades and licence buybacks intended to address resource over-allocation, and (ii) revival and rationalisation of hydrological exchange rates for temporary and permanent water trades, with the aim of rigorously accounting for third-party effects.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 17 Issue 1 - The development of a new methodology to interpret run
           of river salinity data to assess salt inflow to the River Murray
    • Abstract: Burnell, R; Bekesi, G; Telfer, A; Forward, P; Porter, B
      In addition to the threat posed by high salinity to drinking water, increased salinity in the River Murray also represents a threat to the health of floodplains, wetlands and may increase the costs of infrastructure maintenance. In the Lower Murray Basin most of the salts in the river originate from groundwater. Run of river salinity surveys are used to measure salt inflow. They measure electrical conductivity every kilometre over five consecutive days, at low and steady river flows. For a robust interpretation of salt inflow, the background electrical conductivity has to be removed from the measurements. The existing methodology is robust for analysing cumulative salt inflows over river reaches but assigns salt inflows up to several kilometres downstream from where they actually occur. A new method has therefore been developed to assign the salt inflow more closely to the location where it actually occurs and at the correct rate. The new methodology is based on the assumptions that salt inflow is the function of space only (during the survey) and the background conductivity can be described by the temporal variations observed at a fixed location. These in turn allow better targeting of the high salt inflow zones for salt interception.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 17 Issue 1 - A standard approach to baseflow separation using the
           Lyne and Hollick filter
    • Abstract: Ladson, AR; Brown, R; Neal, B; Nathan, R
      The digital filtering approach to baseflow separation suggested by Lyne and Hollick (1979) has been widely used and is available in a number of computer packages. However, details of the approach used by different authors vary and so do the results. This means baseflow volumes and indices reported by different authors, and at different times, are difficult to compare. We propose a standard method for baseflow separation using the Lyne and Hollick digital filter. This includes reflecting the flow series at the start and end of the record to reduce 'warm up' effects and the adoption of specific starting values for each filter pass.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 17 Issue 1 - Investigation into probabilistic losses for design
           flood estimation: A case study for the Orara River catchment, NSW
    • Abstract: Loveridge, M; Rahman, A; Hill, P; Babister, M
      Australian Rainfall and Runoff (Pilgrim, 1987) recommends the design event approach (DEA) as the preferred method for estimating design flood hydrographs, in which a single design event is adopted. More recently, Monte Carlo simulation has been used to allow for the probabilistic nature of input variables in flood modelling. This paper adopts a Monte Carlo framework to evaluate the impact of probabilistic losses on design flood estimates for the Orara River catchment in northeastern NSW. A RORB runoff routing model was used to derive loss values for both the initial loss-continuing loss (IL-CL) and initial loss-proportional loss (IL-PL) models. It has been found that the initial, continuing and proportional losses can be approximated by the Gamma, Weibull and Beta distributions, respectively. When these distributions were compared with non-parametric distributions, differences in the flood estimates were found to be minimal. Another finding was that peak floods estimated using the DEA were more biased for the IL-CL model, than for the IL-PL model. In comparison to the at-site flood frequency curve the IL-CL model produced an overall better fit of the shape of the curve, however, the IL-PL model provided a better fit to the observed flood peaks for mid-range events.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 17 Issue 1 - Predictability and chaotic nature of daily streamflow
    • Abstract: Dhanya, CT; Nagesh Kumar, D
      The predictability of a chaotic series is limited to a few future time steps due to its sensitivity to initial conditions and the exponential divergence of the trajectories. Over the years, streamflow has been considered as a stochastic system. In this study, the chaotic nature of daily streamflow is investigated using autocorrelation function, Fourier spectrum, correlation dimension method (Grassberger-Procaccia algorithm) and false nearest neighbour method. Embedding dimensions of 6-7 obtained, indicate the possible presence of low-dimensional chaotic behaviour. The predictability of the system is estimated by calculating the system's Lyapunov exponent. A positive maximum Lyapunov exponent of 0.167 indicates that the system is chaotic and unstable with a maximum predictability of only 6 days. These results give a positive indication towards considering streamflow as a low dimensional chaotic system than as a stochastic system. Prediction is done using local polynomial method for a range of embedding dimensions and delay times. The uncertainty in the chaotic streamflow series is reasonably captured through the ensemble approach using local polynomial method.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 17 Issue 1 - Preface
    • Abstract: Phillips, Brett C
      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 16 Issue 2 - Use of the 2-year, 6-hour rainfall in the design of
           erosion control works
    • Abstract: Ladson, AR
      The design of soil erosion control works often involves the use of the revised universal soil loss equation to estimate potential soil loss (Renard et al, 1991) and the rational method to estimate peak flows (eg. Landcom, 2004). Both these methods require the use of design rainfall intensities but for different purposes. This paper clarifies the use of design rainfall in these approaches, identifies where confusion may occur, and suggests an approach that is consistent with current engineering guidelines.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 16 Issue 2 - Flow resistance in four rivers in Victoria, Australia
    • Abstract: Ladson, AR; Lang, SM; Smart, GM; Anderson, BG; Rutherfurd, ID
      Reach-representative estimates of Manning's n are presented for a range of discharges in four rivers in Victoria, Australia: Acheron River at Taggerty, Merrimans Creek at Stradbroke West, Mitta Mitta River at Hinnomunjie Bridge, and Tambo River at Ramrod Creek. These Manning's n values have been determined from discharge and water surface slope measurements at gauging stations on these four rivers. Manning's n was found to remain almost constant over a range of common discharges, and was found to be a better descriptor of flow resistance than Darcy Weisbach f, Chezy C and log-law Zo for these rivers.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 16 Issue 2 - Analysis of scour characteristics in presence of
           aerated crossing jets
    • Abstract: Pagliara, S; Palermo, M
      Jets scour is a major topic in hydraulic engineering. It has to be carefully analysed in order to understand the mechanism and predict its geometry. The jets configuration has a deep influence on the scour features. In the present paper the analysis was conducted in presence of two symmetric crossing jets, varying the discharge, the air content, the tailwater level in the downstream stilling basin, the angle between the jets and the vertical distance of the jets crossing point from the water surface, for different vertical jets angle. It was proven that the presence of the air in the jets deeply affects the scour morphology. The scour geometry was analysed and compared with the respective obtained in black water conditions. Useful practical relationships are proposed to estimate the main scour hole dimensions. The analysis was also extended to non-dimensional profiles and it was proved that the effect of air content on them is negligible.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 16 Issue 2 - Image analysis and reconstruction of the 2008 Toga
           River Flash Flood in an urbanised area
    • Abstract: Fujita, I; Kunita, Y; Tsubaki, R
      In the afternoon of 28 July 2008, a flash flood occurred in the water-friendly reach of the Toga River in Kobe City, tragically drowning five people that included three children. They were among about 50 people enjoying the river environment. The flash flood was caused by sudden localised torrential rain in urbanised area of the small river basin. The onset of the flash flood was captured by a river monitoring camera as consecutive still images, while the surface fl ow just after the peak flow was videotaped by a TV cameraman without using a tripod. In order to estimate the peak discharge of the flash flood, the space-time image velocimetry technique developed by the authors was applied to the video images after applying image stabilisation. The estimated discharge was used as an input hydraulic parameter of the 2D numerical simulation, with a success of reproducing the transient flow pattern observed by the monitoring camera. In addition, the distribution of hydrodynamic force the people in the river were exposed to was calculated to reveal the difficulty of evacuation in flash flood condition, even when the depth of water is less than knee high.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 16 Issue 2 - Application of empirical scale correction factors with
           regional flood prediction equations: A case study for eastern Australia
    • Abstract: Zaman, MA; Haddad, K; Rahman, A
      Regional flood prediction equations are generally developed based on the recorded streamflow data in medium- to large-sized catchments, but these equations are often applied in practice to very small catchments. Since there is little/no recorded streamflow data available for very small catchments, the applicability of the developed regional flood prediction equations to these catchments cannot be verified directly. The empirical observations reveal that smaller catchments produce "steeper flood frequency curves" than larger catchments given all the flood generation factors remaining the same. This paper uses data from 429 catchments from the states of Victoria, New South Wales and Queensland to examine the effects of catchment size on flood quantile estimates. An empirical scale correction factor is proposed that can partially account for the effects of decreasing catchment size on flood quantile estimates. Independent testing using 32 catchments shows that the proposed method provides reasonable results for the catchments as small as 2.3 km2, but its applicability to very small catchments (ie. smaller than 2.3 km2) cannot be verified due to the unavailability of recorded streamflow data.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 16 Issue 2 - Land management impacts on water quality following
           fire in a major water supply catchment
    • Abstract: Wade, A; White, I; Worthy, M; Gill, AM; Mueller, N; Taylor, P; Wasson, RJ
      Salvage harvesting and land clearance to re-establish radiata plantations in the lower catchment followed the January 2003 bushfires in the Cotter River water supply catchment. We report impacts of post-fire catchment disturbance on water quality and preliminary results of a recently completed works program to improve water quality. Suspended sediment concentrations as high as 39,000 mg/L and massive annual specific sediment yields between 520 and 950 t/km2/a from the 42 km2 salvaged pine area occurred over three low-intensity rainfall years following the fire. In contrast, reservoir turbidity profiles in naturally-regenerated, upper-catchments returned to pre-fire conditions within 12 to 18 months.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 16 Issue 2 - Estimating the change in streamflow resulting from the
           2003 and 2006/2007 bushfires in Southeastern Australia
    • Abstract: Mannik, RD; Herron, A; Hill, PI; Brown, RE; Moran, R
      Significant bushfires occurred around the Great Dividing Range in south eastern Australia in the summers of 2003 and 2006/2007. The combined scale of these bushfires presents important hydrological implications for the region in the coming decades. This paper reports on results of a project funded by the Victorian Department of Sustainability and Environment to perform a broad-scale assessment of the total water yield impact resulting from the two bushfires. Impacts are estimated in terms of annual changes in streamflow compared to conditions immediately prior to the 2003 bushfire. The modelling approach used to estimate the impacts on streamflow was the Bushfire Impact on Streamflow Yield model. Annual streamflow response curves were produced at each study catchment outlet, as well as spatially explicit datasets showing change in streamflow across the study catchment. Impacts from the two fires were then aggregated to estimate the total change in streamflow yield relative to flows into the River Murray, Eildon Reservoir and the Gippsland Lakes.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 16 Issue 2 - Water information services for Australians
    • Abstract: Vertessy, RA
      On 26 January 2007, following a prolonged period of severe drought and rapidly diminishing water supplies, the Australian Prime Minister announced the National Plan for Water Security, a 10-point plan significantly enhancing Commonwealth involvement in the nation's water affairs. One of the pillars of the reforms was a significant commitment to improve the quality and coverage of Australia's water information. The Bureau of Meteorology was directed to implement the Improving Water Information Program, supported by significant funding and a legislative mandate under the Water Act 2007. This paper traces the evolution of these new water information arrangements and highlights some of the new water information services that have emerged under the program. They include periodic water resource assessments, an annual national water account, various web products summarising the state of our water resources, and a seasonal streamfl ow forecasting service. Like their weather and climate service counterparts issued by the Bureau of Meteorology, these services have some important characteristics, namely that they are enduring, repeatable, robust, trusted and tailored to end user needs. The success of the program to date has been facilitated by appropriate resourcing levels, a clear legislative mandate, high levels of cooperation across the water sector and strong support from the water research and development community.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 16 Issue 2 - Preface
    • Abstract: Phillips, Brett C
      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 16 Issue 1 - Discussion on "Flood frequency and design flood
           estimation procedures in the United States: Progress and challenges" by JF
           England, Jr
    • Abstract: French, R
      With revision of Australian Rainfall and Runoff under way, it is heartening to read of others headed in the direction of improvement to hydrologic design techniques.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 16 Issue 1 - The hydrologic impacts of farm dams
    • Abstract: Nathan, R; Lowe, L
      Farm dams play an important role in Australian life. Small dams storing just a few megalitres provide essential supplies for stock and domestic consumption. Larger dams are used for irrigation purposes, and play a vital role in increasing the productivity, and hence viability, of many agricultural enterprises. Dams are also constructed for recreational and ornamental purposes, for aquaculture, and as artificial wetlands for environmental purposes. Over time there has been an increase in the number of dams used for irrigation purposes. There has been a general trend towards constructing larger dams, some impounding many hundreds of megalitres, to provide additional security of supply and to irrigate high value crops. An increase in the number of farm dams used for domestic, stock or aesthetic purposes is also expected in new peri-urban developments.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 16 Issue 1 - Water-sensitive cities: Applying the framework to
    • Abstract: Lloyd, S; Wong, T; Blunt, S
      Key thinkers have been developing a strategic framework for transforming cities into water-sensitive cities. Transforming Melbourne into a water-sensitive city has been a focus of the City of Melbourne through undertaking an integrated water management strategy coined "city as a catchment", and is being progressively undertaken by other local municipalities. Critical to applying the framework has been to establish water quality and water conservation targets that councils are able to commit to. The paper outlines a key approach adopted to diversify water supply options through the provision of both centralised and decentralised water schemes, ranging from the simple rainwater tank for non-potable use to large scale stormwater harvesting schemes. Stormwater not harvested is treated to improve its quality prior to discharge to the environment for the protection of aquatic ecosystems. The paper presents an overview of the implementation plan for the City of Melbourne that clearly establishes a vision for the city and demonstrates how selection of on-ground works relate to water conservation, best practice stormwater management targets and wastewater minimisation. This includes implementing sustainable urban water management approaches across all of the city's assets (including parks and gardens, building and roads). In implementing the framework, Council's influence would extend adoption beyond the public domain by facilitating private participation through regulations and provisions of incentives for the uptake of WSUD in the private domain (including commercial and residential sites).

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 16 Issue 1 - Evaluation of an evaporation suppressing monolayer
           system in a controlled wave tank environment: A pilot investigation
    • Abstract: Schouten, P; Putland, S; Lemckert, C; Underhill, I; Solomon, D; Sunartio, D; Leung, A; Prime, E; Tran, D; Qiao, G
      Due to long-term drought conditions coupled with the apparent influence of global warming, compounding water loss has been a very serious issue across the vast majority of the Australian continent. During these drought conditions, the evaporative effect outweighs the amount of precipitation being received on a year to year basis. Several methods have been introduced in recent history to inhibit the amount of evaporative loss from various types of water bodies such as the application of thin layer chemical films (monolayers). A series of solvent, solid and suspension derived prototype monolayers, based on ethylene glycol monooctadecyl ether (C18E1), are examined in this current study as an approach to eliminate the problems seen to occur with the previous types of monolayers. This research evaluates the fundamental effect of wind and wave based activity upon these prototype monolayers in an atmospherically controlled enclosure positioned over a large extended water tank using real-time environmental measurements. Selected performance results for the prototype monolayers as measured within the enclosed water tank were compared to results measured from a control monolayer film based on a commonly used octadecanol suspension film. The results show that under varying wind and wave conditions the prototype monolayers inhibit evaporation at a level similar to or better than the octadecanol standard, even when delivered at lower raw dosages.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 16 Issue 1 - Predicting groundwater response times and catchment
           impacts from land use change
    • Abstract: Beverly, C; Hocking, M
      Natural resource managers are becoming increasingly interested in incorporating into policy and investment frameworks the likely lag between land use change and groundwater response time. Until recently, predicting the response times of groundwater systems to a range of investment strategies (eg. agronomic changes and recharge management options) has relied on bounded analytical solutions or empirical observations from limited transect monitoring trials. This paper describes and evaluates an approach to estimate spatial groundwater response times to changes in groundwater recharge from land use and/or climate change. The approach is based on linking an unsaturated catchment model to a multi-layered distributed groundwater model and was applied to the upper Loddon Catchment (6113 km2) in southwestern Victoria, Australia. The objectives of this paper are to (i) present spatial and temporal variation estimates in groundwater response times and (ii) identify locations in the landscape which have the greatest impact on watertable level. The modelling approach presented in this paper demonstrates the capacity to link a suite of farming system models into a catchment framework to derive spatially explicit recharge estimates which are integrated into a distributed groundwater model. In combination with the catchment depth to watertable impact mapping, the response time predictions derived using this modelling approach offer robust estimates of storage-discharge characteristics of catchments in contrast to idealised groundwater analogues which were found not to adequately capture complex groundwater interactions and within-catchment dynamics.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 16 Issue 1 - Design rainfall temporal patterns in Australian
           'Rainfall and Runoff': Durations exceeding one hour
    • Abstract: French, R; Jones, M
      The current edition of Australian Rainfall and Runoff espouses the design event approach in which a single flood is the "event" with which the hydraulic structure is expected to cope during its working life. The uniform rainfall of the selected average recurrence interval requires a temporal pattern before input to a catchment model. Australian Rainfall and Runoff provides temporal patterns for each of eight defined zones, with 20 specific durations and two classes of average recurrence interval. These patterns are inconvenient to use, especially for other than specified storm durations, and at zone boundaries when differently-shaped patterns apply. This paper shows that distinctions between zones and average recurrence intervals are not significant. Only two of the 144 temporal patterns for durations 1.5 to 24 h are significant in flood design practice, and these are replaced with continuous equations that allow design storm durations to be divided into any number of increments.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 16 Issue 1 - Design flood estimation in Western Australia
    • Abstract: Flavell, D
      This paper provides details of flood frequency procedures developed for the Pilbara, Kimberley, Wheatbelt and Goldfields regions of Western Australia, which should provide better estimates of design floods than the methods recommended in the 1987 version of Australian Rainfall and Runoff. The first section of the paper discusses the adequacy of the stream flow data on which the regional flood frequency procedures (RFFPs) are based and identifies the large extrapolation of the gauging station rating curves and the general underestimation of the magnitude of larger flood events. This leads to the conclusion that a conservative approach is required when developing a RFFP. A description of the general approach taken in developing the RFFPs is then given. Details of the RFFPs developed for each region follow and finally a comparison is made between the magnitudes of the floods in each region.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 16 Issue 1 - Preface
    • Abstract: Phillips, Brett C
      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 15 Issue 2 - The non-impact of debris blockages on the August 1998
           Wollongong flooding
    • Abstract: French, R
      As part of the revision of Australian Rainfall and Runoff, Working Party 11 - Debris Blockage of Waterways is determining how flood-mobilised debris might best be accounted for in the design of the waterway openings of hydraulic structures. The claim of much data on debris blockage of drainage structures in the 1998 Wollongong flooding has been examined, and the finding is that none of that event's data quantifies the degree of hydraulic blockage of waterways by debris.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 15 Issue 2 - Discussion on "Incorporating drought management
           planning into determination of yield" by B Berghout
    • Abstract: French, R
      Review(s) of: Having worked in an era when hydrologists were unconcerned with water policy, water management or water environment, this writer was interested in tackling a paper on a water delivery technology.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 15 Issue 2 - Model comparisons for tracer experiments at a clear
           water storage tank
    • Abstract: Crowther, JM; Dandy, GC
      A fluoride tracer experiment was conducted to investigate mixing processes and residence times in a cylindrical clear water storage tank at the Stromlo Water Treatment Plant, Canberra, ACT. Four different modelling techniques have been used to simulate the experimental results: computational fluid dynamics (CFD), a single continuously stirred tank reactor (CSTR), two CSTRs in series, and a series/parallel combination of two CSTRs (NM). Flow of a conservative tracer through the tank has been simulated at the rated flow from the works using the PHOENICS (CFD) program. The CFD simulation agrees closely with the measured fluoride concentrations and requires no fitted parameters. The agreement with the experimental data for NM is comparable with the CFD and a little better than two CSTRs in series. The poorest agreement was obtained with a single CSTR model.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 15 Issue 2 - Social considerations in domestic water pricing: A
           case study of Perth, Western Australia
    • Abstract: Wasimi, SA; Hassa, S
      Domestic water pricing is a challenging balancing act of the three critical dimensions of sustainability: economic, environmental and social objectives (OECD, 2010). The increasing block tariff approach to water pricing is growing in popularity throughout the world because, arguably, it is seen to best address all three dimensions. However, social equity considerations are often at odds with other criteria and needs special scrutiny, as affordability and equity aspects may not be properly addressed especially when income and household size are not accounted for. This paper looks at social considerations that are relevant for decision making in water pricing for the city of Perth, Western Australia and proposes a pricing scheme that would address the social issues satisfactorily. The optimisation model, particle swarm optimisation, which has been used in this study can also be applied when multiple objective functions that include other considerations such as economic efficiency and environmental sustainability are used.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 15 Issue 2 - Design criteria for channel-forming flows in waterways
           of urbanising catchments
    • Abstract: Argue, JR; Pezzaniti, D; Hewa, GA
      Adequate consideration of the joint problems of natural channel stability and bio-community preservation in greenfield catchments experiencing development has been lacking in the WSUD (water sensitive urban design) guidelines promoted in eastern and southern Australia in recent years. The paper offers retention technology as a vital ingredient of catchment management, enabling urbanisation to proceed with minimum loss of waterway environmental values.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 15 Issue 2 - Estimation of mean annual runoff across Southeast
           Australia by incorporating vegetation types into Budyko framework
    • Abstract: Zhang, Y; Chiew, FHS
      This paper uses the Budyko and Fu models to estimate mean annual runoff in 0.05 degrees grid cells across southeast Australia, and assesses the estimates against observations in 323 catchments. The results show that the Budyko model can provide reasonable estimates of runoff and is suitable for data limited regions. In regions where there are some streamfl ow data available, the calibration of a single parameter in the Fu model gives better runoff estimates than the Budyko model and similar to regionalised rainfall-runoff models. In drier regions, the consideration of different vegetation types in the Fu model can improve the modelling results.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 15 Issue 2 - Drought assessment and forecasting: A case study on
           the Yarra River catchment in Victoria, Australia
    • Abstract: Barua, S; Ng, AWM; Perera, BJC
      Drought is a natural phenomenon, and has widespread and significant impacts on the world's economy, environment, industries and the wider community. Early detection of droughts helps to implement drought mitigation strategies and measures before they occur. Therefore, drought forecasting plays an important role in the planning and management of water resources systems, especially during dry climatic periods. However, drought assessment and forecasting are not always easy tasks. In this paper, an approach that was developed and tested for drought assessment and forecasting is presented together with a case study on the Yarra River catchment in Victoria (Australia). An evaluation of existing drought indices was first conducted in this study, which led to the development of a new non-linear aggregated drought index (NADI). The NADI defines a broad perspective of dryness within the catchment rather than the traditional individual meteorological, hydrological and agricultural subcategories. Thereafter, a novel drought forecasting modelling approach was developed using the NADI time series. The results show that the developed forecasting models are capable of forecasting drought conditions well up to 6 months ahead forecasts which were statistically significant at 1% level. The outcomes of this study will be useful for water resources managers to assess droughts effectively and forecast future drought conditions, which will allow them to plan ahead the future water management activities especially during drought periods.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 15 Issue 2 - Abstracts
    • PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 15 Issue 2 - Preface
    • Abstract: Phillips, Brett C
      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 15 Issue 1 - Calibration and sensitivity analysis of urban drainage
           models: MUSIC rainfall/runoff module and a simple stormwater quality model
    • Abstract: Dotto, CBS; Deletic, A; McCarthy, DT; Fletcher, TD
      Model calibration and sensitivity analysis of stormwater models are required to assess model performance; it is very unlikely that non-calibrated models will lead to reasonable results. The aim of this paper is to present results of the calibration and sensitivity analysis of the key parameters used in flow modelling by MUSIC and parameters of a simple stormwater quality model. The assessment of the models is undertaken using a Monte Carlo Markov Chain approach. We describe the models' performance, provide information on their sensitivity to parameters and also discuss the correlation between these parameters. This work will help practitioners to understand importance of the MUSIC parameters that they usually use without calibration. The information reported in the results will also help to guide future development of stormwater quality models and the data needed to support it.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 15 Issue 1 - The effect of rainwater tank design on sediment re-
           suspension and subsequent outlet water quality
    • Abstract: Magyar, MI; Ladson, AR; Mitchell, VG; Diaper, C
      This paper reports the results of laboratory experiments investigating the effect of rainwater tank design on re-suspension of accumulated sediment and the resultant water quality. Twenty-eight different configurations that represented different tank designs in combination with various water levels and quantities of stored sediment were investigated. Re-suspension of sediment was observed during all experiments regardless of the position of the top inlet (whether side or centrally positioned), position of the bottom outlet (50, 100, 200, 400 and 600 mm above the base of the tank), the shape of the tank base (flat or conical), the initial water level in the tank (empty, quarter full or half full), the sediment thickness (10 or 20 mm), the particle size (two particle size ranges) or inflow rate (0.5 or 1.0 L/s). The re-suspended sediment contaminated the out-flowing water, and the greatest impact (worst outcome for water quality) was observed for a centrally located top inlet and an outlet located 50 mm above the tank base. The least contamination of the out-flowing water was observed when the inlet was positioned on the side of the tank. To reduce the potential for contamination of the out-flowing water, it is recommended that rainwater tanks preferably have a side inlet and a conical base, that the sediment thickness in the tank be maintained at low levels by regularly cleaning the tank, and that the tank water be not used during or immediately following rainfall events.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 15 Issue 1 - Comparison of ordinary and generalised least squares
           regression models in regional flood frequency analysis: A case study for
           New South Wales
    • Abstract: Haddad, K; Rahman, A; Kuczera, G
      Regional flood frequency analysis (RFFA) techniques are commonly used to estimate design floods for ungauged catchments. In Australian Rainfall and Runoff (ARR), the probabilistic rational method (PRM) was recommended for eastern New South Wales (NSW). Recent studies in Australia have shown that regression-based RFFA methods can provide more accurate design flood estimates than the PRM. This paper compares ordinary least squares (OLS) and generalised least squares (GLS) based quantile regression techniques using data from 96 smallto medium-sized catchments across NSW for average recurrence intervals of 2 to 100 years. The advantages of the GLS regression are that this accounts for the inter-station correlation and varying record lengths from site to site. An independent test based on both the split-sample and one-ata-time validation approaches employing a wide range of statistical diagnostics indicates that the GLS regression provides more accurate flood quantile estimates than the OLS one. The developed regression equations are relatively easy to apply, which require data for only two to three predictors, catchment area, design rainfall intensity and stream density. The findings from this study together with those from other RFFA studies being examined as a part of ARR upgrade projects will inform the development of RFFA techniques for inclusion in the revised edition of ARR.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 15 Issue 1 - Regional flood frequency for Queensland using the
           quantile regression technique
    • Abstract: Palmen, LB; Weeks, WD; Kuczera, G
      Design flood estimation for small- and medium-sized catchments is a frequent requirement for a wide range of projects. While each individual project in this category is likely to be relatively small, the total value of projects that rely on design floods for the design is very high. The currently adopted approaches for Queensland are published in Australian Rainfall and Runoff. Several approaches are described, though the Main Roads Rational Method (MRRM) is predominant in practice. This method has been used throughout Queensland for many years, but the basis of the method is not considered reliable because of the lack of recorded data used in the development and the lack of independent testing. The development of the new procedure described in this paper has used all suitable streamflow data available for the state. It therefore has a better foundation and the results can be accepted with more confidence. The approach presented uses the quantile regression technique to develop a procedure for calculating design floods for ungauged catchments that relates the design flood discharges to readily available catchment characteristics. The method is then tested against the currently available MRRM. This paper provides an input to part of the upgrade of Australian Rainfall and Runoff, currently underway.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 15 Issue 1 - Flood frequency and design flood estimation procedures
           in the United States: Progress and challenges
    • Abstract: England, JF
      Design flood estimation procedures in the United States have traditionally focused on two primary methods: frequency analysis of peak flows for floodplain management and levee design; and deterministic, probable maximum flood (PMF) estimates for design of dams and nuclear facilities. Federal Agencies in the United States, including the Bureau of Reclamation, US Geological Survey and Army Corps of Engineers, are currently examining potential changes to these standard flood hydrology procedures. This paper presents overviews of some ongoing investigations and data collection studies to support potential changes in design flood estimation. For floodplain management, the current guideline is Bulletin 17B, which specifies the use of an LP3 distribution, method of moments and regional skew information. Potential improvements to Bulletin 17B currently under consideration are: (i) use of historical and paleoflood information; (ii) adjusting for low outliers; (iii) improved plotting positions; and (iv) confidence intervals. Ongoing testing results are presented, highlighting the expected moments algorithm. In contrast to well-established, deterministic (PMF) extreme flood estimates for dam safety, agencies are now moving toward risk-based techniques. The Bureau of Reclamation has developed and applied several methods in order to estimate extreme floods and probabilities for large dams. Techniques used to date are summarised, along with those being considered by other US agencies. Improvements to extreme flood databases that provide inputs, including extreme storms and probable maximum precipitation estimates, precipitation frequency and paleofloods, are ongoing. Some challenges to updating design flood methods and data, including institutional effects, national scale, research to operations and use of new technologies, are described.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 15 Issue 1 - Coping with severe drought: Stories from the front
    • Abstract: Barton, AF; Briggs, S; McRae-Williams, P; Prior, D
      The last 12 years has seen extreme drought in western Victoria. This has impacted on the area in many ways, but none more so than in the provision of basic water supplies to people. To meet the challenge of drought, headworks storages have had to be operated at record low levels, severe water restrictions imposed, water carting programs established, alternative sources of water, and new technologies developed and used. Significant changes have also been made to the water supply infrastructure in the region, most notably the Northern-Mallee and Wimmera-Mallee Pipelines. This paper relates the story of how water resources were managed and bulk water was delivered to around 70,000 customers over a geographic spread of 62,000 km2, or about 30% of Victoria. Discussion on the social, environmental and economic impacts on the region are also provided.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 15 Issue 1 - Establishment of environmental water in the Murray-
           Darling Basin: An analysis of two key policy initiatives
    • Abstract: Horne, A; Freebairn, J; O'Donnell, E
      Policy to protect river ecosystems has changed rapidly in Australia, and the mechanisms to both establish and manage environmental water are still evolving. Policy has moved from providing a fixed environmental target (albeit varying between years) to one in which the environment can actively participate in the market, with the possibility of better fulfilling variable water requirements. However, the inherent nature of the sustainable diversion limit (SDL), established under the Water Act 2007, is that it represents a fixed allocation to the environment. This paper considers the interaction of the new SDL for the Murray-Darling Basin and potential issues arising from the interaction with the government buyback initiative. While both the SDL and buyback have been discussed extensively, the interaction between the two policies has received little debate. Pairing these two policy initiatives will have implications for the flexibility of management of the environmental water, and the ability for on-going trade between the environment and consumptive water users. Our position is that the SDL, or preferably rules-based water, should reflect an absolute minimum limit on environmental water requirements, while the buyback should provide the environmental water as tradable water rights with the flexibility to respond to shifts in the environmental water demand curve by providing environmental water over and above the SDL. If both a buyback and minimum flow rules are in place, the SDL will provide little additional benefits but increase administrative costs and reduce flexibility. This has significant implications for the way the SDL and buyback strategy are structured.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 15 Issue 1 - Water: A personal matter
    • Abstract: Askew, AJ
      This paper is a summary of the Munro Oration delivered in Brisbane on 29 June 2011. It presents water as an extraordinary substance that is critical to our very existence and therefore demands of us both respect and commitment to its protection and wise management. It argues for a balanced approach to establishing water programs in which research, teaching, practical application, funding and governance all have a role to play. It outlines the value of personal contacts within the freshwater community and calls for the Australian members of that community to be active at both national and international level in promoting Australian expertise and in learning from that of other countries.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 15 Issue 1 - Preface
    • Abstract: Phillips, Brett C
      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 14 Issue 2 - Discussion on 'Addressing Climatic Non-stationarity in
           the Assessment of Flood Risk'
    • Abstract: French, R
      Practitioners will have to express their design uncertainties more often and more clearly. Previous editions of Australian Rainfall and Runoffhave been written in language to engender confidence in flood numbers and the producers thereof, so expressions of uncertainty are almost totally absent from its pages.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 14 Issue 2 - Modelling the Environmental Water Reserve: A Case
           Study Exploring the Effects of the Environment's Water Entitlement in a
           Complex Water Supply System
    • Abstract: Godoy, W; Barton, AF
      The objective of the present study was to demonstrate the effect the environment's entitlement configuration has on the volume of water supplied to the environment, and the overall efficiency of the water supply system under the historic climatic sequence and climate change. The modelling work is undertaken using the REALM simulation package, with the results presented in case study form based on the Wimmera-Mallee system, outlining the changes in the total system water balance post-Wimmera Mallee Pipeline, changes in the environment's reliability of supply, and exceedance plots for environmental flows and headworks loss. The outcomes of this study demonstrate the need to consider the trade-offs between large entitlements of low reliability and small entitlements of high reliability as part of the system reconfiguration process, given the effect it has on total system efficiency, particularly in an uncertain climate future.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 14 Issue 2 - Sensitivity Analysis of Yield Estimate of Urban Water
           Supply Systems
    • Abstract: King, DM; Perera, BJC
      Sensitivity analysis (SA) theory and techniques were used in this study to estimate the sensitivity of input variables on the yield estimate of an urban water supply system. The SA techniques considered were Morris method and Fourier amplitude sensitivity test (FAST), including the related extended FAST. A case study on a simple urban water supply system was conducted to assess the applicability and to study the limitations of these techniques and the SA framework adopted. Findings showed that the streamflow dominated all experiments, with the supply reliability threshold, the upper restriction rule curve and the consecutive months in restrictions threshold of subsequent importance. In a screening pass, importance ranking of the 26 considered variables from the Morris method were verified with FAST and extended FAST.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 14 Issue 2 - Design Flood Estimation in Ungauged Catchments: A
           Comparison between the Probabilistic Rational Method and Quantile
           Regression Technique for NSW
    • Abstract: Rahman, A; Haddad, K; Zaman, M; Kuczera, G; Weinmann, PE
      Design flood estimation for ungauged catchments is often required in hydrologic design. The most commonly adopted regional flood frequency analysis methods used for this purpose include the index flood method, regression based techniques and various forms of the rational method. This paper first examines the similarities and differences between the probabilistic rational method (PRM) (the currently recommended method for Victoria and eastern NSW in Australian Rainfall and Runoff) and the generalised least squares (GLS) based quantile regression technique (QRT). It then uses data from 107 catchments in NSW to compare the performance of these two methods. To make a valid comparison, the same predictor variables and data set have been used for both methods.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 14 Issue 2 - Estimation of Major Floods: Applicability of a Simple
           Probabilistic Model
    • Abstract: Haddad, K; Rahman, A; Weinmann, PE
      Estimation of major flood flows is needed in the design and operation of large water infrastructure. This paper presents a simple probabilistic model (PM) that can be used to derive 'easy to apply' prediction equations for estimation of major flood flows. The proposed method assumes that the maximum observed flood data over a large number of sites in a region can be pooled together by accounting for the across-site variations in the mean and standard deviation values. The method is developed and tested in this paper using data from 227 catchments across Victoria and NSW. The application to ungauged catchments involves the development of prediction equations using generalised least squares regression for the mean and coefficient of variation of the annual maximum flood series as a function of catchment characteristics.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 14 Issue 2 - Rainfall-runoff Modelling across Southeast Australia:
           Datasets, Models and Results
    • Abstract: Vaze, J; Chiew, FHS; Perraud, J-M; Viney, N; Post, D; Teng, J; Wang, B; Lerat, J; Goswami, M
      This study describes a daily rainfall, potential evaporation and streamflow data set compiled for the important water resources region of southeast Australia, and the application of six commonly used lumped conceptual rainfall-runoff models to estimate daily runoff across the region. The daily climate data set and the daily modelled runoff are available from 1895 to 2008 at 0.05 grid resolution across the region. The modelling exercise indicates that the rainfall-runoff models can generally be calibrated to reproduce the daily observed streamfl ow (for 232 catchments in the high runoff generation areas), and the regionalisation results indicate that the use of optimised parameter values from a gauged catchment nearby can model runoff reasonably well in the ungauged areas. There are differences between the six models, but they are relatively small when used to describe aggregated results across large regions.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 14 Issue 2 - Rainfall Energy Loss: An Empirical Model
    • Abstract: Pudasaini, MS; Shrestha, SP
      Kinetic energy of a rainfall event is determined by its intensity. However, the effective kinetic energy reaching a soil surface that is responsible for detachment and transportation of soil particles is often less than the total kinetic energy of the rainfall event. This is because of the cushioning effect a film of water provides. Therefore it is essential to account for the loss in kinetic energy of a rainfall event and incorporate it in simulation models to accurately estimate soil erosion. This paper proposes a logarithmic energy loss model to estimate kinetic energy of rainfall reaching the soil surface. The model accounts for the depth of shallow overland flow and rainfall intensity. The empirical model was established through the set of data obtained from a rainfall simulation experimental setup consisting of a laboratory-scale tilting hydraulic flume, rainfall simulator and a series of sensitive piezoelectric force transducers.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
  • Volume 14 Issue 2 - In Search of the Best
    • Abstract: Dandy, G
      This paper is based on the 2009 Munro Oration given by Prof Graeme Dandy at the 32nd Hydrology and Water Resources Symposium held in Newcastle on 30 November to 3 December 2009. The paper outlines the importance of considering human activity and its impact on the hydrological cycle. It outlines the systems approach, multi-objective planning and evolutionary optimisation, and their application to the planning and design of water resources systems. The contribution of previous researchers and engineers in the development of these techniques is acknowledged. Among them, Crawford Munro provided a shining example of a rational approach to the planning and management of our water resources.

      PubDate: Thu, 2 Nov 2017 11:47:41 GMT
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