Eurobodalla Integrated Water Cycle Management Strategy

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98 Eurobodalla Integrated Water Cycle Management Strategy Consultation with the affected property owners and with the Water Management Committee. Groundwater Recharge Another environmental reuse opportunity is the use of stormwater and reclaimed water to recharge groundwater aquifers. Implementing this type of opportunity would be heavily dependent on having favourable aquifer conditions. Extensive groundwater investigations to prove the suitability of the aquifer and to establish design parameters would be essential before considering this reuse opportunity. Areas where the opportunity may be viable include South Durras and Broulee. When evaluating if the Broulee and South Durras Aquifers are appropriate for water storage and reuse, consideration needs to be given to the designated beneficial uses for the groundwater. The designated beneficial uses such as irrigation and ecosystem support are determine from: Background groundwater quality, taking into consideration the National Water Quality Management Strategy (1992) which specify guideline values for water quality parameters for different beneficial uses and Local historical and continuing uses of those aquifers where these differ from national and state guidelines. Further information on aquifer storage and recovery can be found in the report by the Centre For Groundwater Studies (2000) Costs The costs for the Northern and Southern reuse schemes are presented in Table 8-13. Table 8-13 Costs for the Regional Reclaimed Water Scheme Capital ($1000) NPV 7% ($m) Northern Scheme 4 842 5 769 Southern Scheme 10 500 11 415 8.5 Regional Integrated Water Cycle Management Options 8.5.1 Overview Having evaluated the range of water resource opportunities using the IWCM process, the next step involves combining these opportunities to form integrated water resources options. These are developed for both the regional water scheme, and for each village/town. Traditionally, water utilities have focused on developing greater supply sources to meet the growing water needs and community expectations. These strategies have been based on traditional engineering solutions such as developing facilities for supply, treatment, storage and distribution. With the emphasis solely on maintaining reliable water supplies, little consideration has been given to the environment. It has been assessed that on balance, higher protection of the river flows of the existing supply sources in the future is preferable (i.e. 95/30 environmental flow regime until 2020
Eurobodalla Integrated Water Cycle Management Strategy and 80/30thereafter). In addition, if in the future off-river storage is required it would be more feasible to construct a facility in the south of the shire to harvest and store high flows of the Tuross River. Modelling has revealed that with the implementation of the immediate and short term measures, based on existing supply sources the regional scheme would be able to meet a water demand of 6 400 ML/a while providing 95 th percentile low flow protection. Future implementation of 80 th percentile low flow would reduce secure yield of the supply system to 4 500 ML/a and necessitate the provision of additional water storage to maintain supply during droughts. The integrated options described below are based on new off-river storage in the south of the shire being implemented by 2020. Table 8-14 below shows how the various opportunities could be bundled to form integrated options to meet the projected year 2032 water needs. Table 8-14 Regional Water Supply Integrated Options Integrated options Traditional 1 2 3 4 5 6 7 Limited Demand Management Comprehensive Demand Management 10 kL rainwater tanks in all new developments and 20% existing houses Provision of reticulated water supply to high priority villages Provision of reticulated water supply to low priority villages Reclaimed Water Reuse Agriculture Non-potable water in new developments (dual reticulation) Aquifer recharge for subsequent nonpotable water use Environmental flow substitution Southern dam for the regional scheme (x 1000 ML) 5.6 1.5 0.9 0.93 1.01 1.01 0.84 0 8.5.2 Description of the Regional Water Supply Integrated Options Traditional This option consists of: Immediate and short term measures as discussion in section 8.3.3. Initially the northern and southern filtration plants would be 45 ML/d and 15 ML/d respectively A waterwise education program Provision of reticulated water supply to high priority villages Provision of reticulated water supply to low priority villages Maximised reclaimed water reuse for agriculture 99
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FACT SHEET 3 Rainwater Tanks 18 Eur
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FACT SHEET 9 Loss Reduction 24 Euro
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38 Number of Persons 2,500 2,000 1,
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42 % Occupancy 80% 70% 60% 50% 40%
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46 Annual Volume (ML/Yr) 2,500 2,00
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9.14.2 What are the Issues? 202 Eur
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9.15.2 What Are the Issues? 208 Eur
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214 ML/a 8000 7000 6000 5000 4000 3
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228 SCENARIO 1 Regional Water Suppl
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