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Ortlipp G.,Goulburn Murray Water
Proceedings of the 34th Hydrology and Water Resources Symposium, HWRS 2012 | Year: 2012

Modernisation projects and Commonwealth purchases of water entitlements across the irrigation networks of Northern Victoria are increasing environmental water holdings. As a result, the delivery and accounting of environmental water has become a new and challenging task for Goulburn-Murray Water. Unlike conventional deliveries to irrigation customers where water is transferred via rivers and/or channels and measured on delivery through farm-gate meters, environmental water is often delivered within specific river reaches themselves. Water has been delivered at target flow rates at desired river gauging stations above normal operating levels. The challenge is to determine how to account for the volume of environmental water used taking into consideration gauged and ungauged tributary inflows, irrigation diversions, losses and existing minimum river flow requirements. Goulburn-Murray Water has had to develop methods for determining use and adapt them as more information became available. © 2012 Engineers Australia.

Wade A.,Aquade Groundwater Services | Cossens B.,Goulburn Murray Water
Hydrology and Water Resources Symposium 2014, HWRS 2014 - Conference Proceedings | Year: 2014

To inform a groundwater management plan for the Lower Campaspe Valley, a need was identified to improve understanding of stream-aquifer interaction along the Campaspe River. This required identifying where the river was gaining or losing, quantifying the leakage flux and assessing how it has changed over time. A review of available literature and water levels facilitated enhanced conceptualisation of the system and identified the key parameters to which flux is sensitive for discrete river reaches. The confined Campaspe Deep Lead aquifer, consisting of sands and gravels, is the main conduit for groundwater flow in the valley. It is hydraulically insulated, but not isolated, from the shallow groundwater and the river by clay aquitards of the Shepparton Formation. The Campaspe River is largely contained within the Coonambidgal Formation, which is the more recent shallow alluvial deposits on the flood plain. The river is hydraulically well connected to the sands of the Coonambidgal Formation. Key factors controlling flux from the river were found to be the width of the Coonambidgal, the location of the Deep Lead relative to the Coonambidgal, the vertical conductance of the Shepparton Formation and the head difference between the river and the Deep Lead. These parameters were assessed for discrete river reaches and calculations performed for the period of available groundwater monitoring data (1980-2010) to quantify the flux. These outputs were then used as inputs to a groundwater balance that informed the development of the groundwater management plan. A key finding of this work was that the River is naturally a losing stream which recharges the Deep Lead via the Coonambidgal and Shepparton Formations. The River has been regulated for decades using an upstream reservoir, Lake Eppalock, to maintain flow. In the Murray-Darling Basin, leakage from the rivers and streams, particularly where they pass from bedrock areas to the Riverine Plains, is considered to have been a long-term natural mechanism for recharge of the aquifers. In this environment, anthropogenic influences of both surface water regulation and confined-aquifer drawdown enhance recharge rates to the confined aquifers. This is not a form of Managed Aquifer Recharge (MAR) as it was not intentional. We propose a new acronym: Fortuitous Aquifer Recharge (FAR)!.

Phillips M.A.,URS Corporation | Maslin K.,URS Corporation | Reynolds A.,Goulburn Murray Water
International Water Power and Dam Construction | Year: 2011

Standing 600ft high, Dartmouth Dam is the highest dam in Australia with a storage capacity of nearly 3.1M acre-feet (3856GL), nearly seven times that of Sydney Harbor. A dam safety risk assessment completed in 2007 identified that the largest contributor to dam safety risk was flood overtopping. Based on the Australian National Committee on Large Dams (ANCOLD) Acceptable Flood Capacity Guidelines, extreme hazard category dams should target the flood capacity equivalent to the Probable Maximum Flood (PMF) as the long-term dam safety standard. When the studies for Dartmouth Dam were completed, URS recommended the Piano Key Weir combined with a parapet wall raise of the dam embankment to progress forward to detailed design. The decision took into account a number of factors, including construction risk, reduction in dam safety risk, capital and life-cycle costs, and potential construction staging.

Price D.,Flood Forecasting Center | Hudson K.,Goulburn Murray Water | Boyce G.,Flood Forecasting Center | Moore R.J.,UK Center for Ecology and Hydrology | And 4 more authors.
Proceedings of the Institution of Civil Engineers: Water Management | Year: 2012

Following the summer 2007 floods in England and Wales, a new context for flood forecasting emerged through the recommendations set out in the Pitt review. This paper presents the operational challenges being addressed by the Flood Forecasting Centre (FFC) - a joint venture between the Environment Agency (EA) and the Met Office (MO) - to deliver forecasts of flood risk across England and Wales with longer lead times (out to 5 days ahead) and, on a shorter timescale, for rapid response catchments. These are both key recommendations of the Pitt review. As a joint venture, the FFC is uniquely placed to meet these objectives and, as a first step, has implemented a distributed hydrological model, grid-to-grid (G2G), calibrated across England and Wales, on the EA's national flood forecasting system. Also fundamental to successfully meeting these objectives is the FFC's ability to utilise the latest MO advances in high-resolution numerical weather prediction and nowcasting of rainfall, including forecasts in probabilistic form. Early results from applying the model to the Cumbria floods of November 2009 demonstrate that this is an effective approach for generating longer lead-time flood forecasts. The results also illustrate that this methodology is best used in combination with current regionally based flood forecasting tools.

Richards L.,Goulburn Murray Water | Cossens B.,Goulburn Murray Water
Proceedings of the 34th Hydrology and Water Resources Symposium, HWRS 2012 | Year: 2012

The Deep Lead aquifer in Victoria's Lower Campaspe Valley region has a history of groundwater use for irrigation dating back to the 1970s. Recently, a groundwater management plan for the Lower Campaspe Valley Water Supply Protection Area has been prepared to protect this high yielding and high quality resource. The Plan was developed by a committee consisting of key agencies and regional groundwater users and proposes important management changes including addressing impacts of locally intensive groundwater pumping, consideration of groundwater extraction impacts on the environment, and greater flexibility relating to groundwater trade and carryover. The Plan was built on a vastly improved understanding of the groundwater system including enhanced mapping of the aquifer extent; better knowledge of the water available for extraction under various climatic conditions; greater recognition buffering capacity of the aquifer system; an appreciation of the aquifer response to intensive groundwater pumping; identification of a hinge zone in the south; and determination of losses from the Campaspe River to the groundwater system. The background to, and content of, the recently developed groundwater management plan for the Lower Campaspe Valley Deep Lead aquifer is described, as are implications for future management of groundwater resources. © 2012 Engineers Australia.

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