Eurobodalla Integrated Water Cycle Management Strategy

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90 Eurobodalla Integrated Water Cycle Management Strategy increased and then significantly reduced for a prolonged period as a result of the higher water usage by the forest during their regrowth phase. Sensitivity analysis with a 10% reduction in the historical streamflows shows little impact on the secure yield. A 10% decrease in streamflows increases the drought storage requirements by 200 ML (2032). Sensitivity to Demand Reduction Programs The demand reduction programs suggested in a previous Section of this report have the potential to reduce the base demand by about 12% in the next 30 years. This will defer the need for the new southern dam by about 15 years. Further it will also deliver consumer savings in water and energy cost and lessens the environmental impact of population increases on water resources. Comparison of the Sensitivity Analysis Table 8-11 below provides the economic implication of each demand and supply variable to the preferred opportunity 2. Opportunity 2 is based on the future storage in the south of the shire. Table 8-11 Comparative Costs for Stand Alone Supply Demand Sensitivities Cost Estimates ($m) Stand Alone Sensitivity to Opportunity 2 Capital Cost NPV @ 7% Demand reduction during drought restrictions 82.0 66.8 Higher environmental flow protection 84.8 73.5 Climate and land use changes 55.8 64.9 Demand reduction programs 55.3 64.6 However it should be noted that the economic impact of two or more supply-demand variations occurring together would be significantly different to that shown in the above table. Detailed cost information is contained in Appendix L 8.4 Opportunities for Reclaimed Water Use ESC aims to recycle and reuse reclaimed water to achieve environmental and social benefits where it is economically viable and socially acceptable. The environmental and social benefits include: Conserving the water resources by reducing water extractions Reducing the direct discharge of reclaimed water to waterways Replacing where appropriate the use of town water with more reliable reclaimed water Enhancing the quality and sustainability of ground and surface waters Supporting and enhancing the local agricultural industry.
8.4.1 Project Initiatives Eurobodalla Integrated Water Cycle Management Strategy In 1998 Council undertook a shire-wide reclaimed water and biosolids reuse study, which canvassed both local and regional land-based reuse opportunities. In view of the high cost associated with the regional schemes, Council has been focusing on some of the local opportunities. Current reuse and recycling initiatives include: Reuse at Batemans Bay and Moruya golf clubs Reuse at Moruya sporting fields Proposed reuse distribution main for the agricultural and industrial areas near Moruya. The project to reuse reclaimed water from a reed bed on Tuross golf course, whilst having secured Government funds, was shelved due to community objections. The use of reclaimed water from Bingie STP for irrigating Tuross Golf Course is still supported by the community. The current reuse projects use about 5% of the average dry weather reclaimed water volumes produced in the shire. The additional initiatives proposed for the area would use an additional 5% of the current dry weather shire flows. 8.4.2 Reclaimed Water Volumes Reclaimed water is currently produced at the five sewage treatment plants owned and operated by Council. Table 8-12 below shows the current and forecast future volumes expected to be produced in the next 30 years from the five plants. Additional volumes may become available if sewage from the currently unsewered villages were to be centrally treated by Council to secondary standards. Table 8-12 Reclaimed Water Volume Projections Description Batemans Bay and Surrounds Volume Average Daily (ML/d) Annual (ML/a) Current Future Current Future 4.0 5.0 1 900 2 300 Tomakin and Surrounds 1.0 1.5 450 700 Moruya and Surrounds 0.8 1.0 380 450 Tuross 0.7 0.8 330 380 Narooma and Surrounds 1.6 2.4 760 1 100 Other Villages - 0.4 - 200 Shire Total 8.1 11.1 3 820 5 130 Table 8-12 shows that in the next 30 years the reclaimed water volume for the shire will potentially increase by about 35%. 8.4.3 Reclaimed Water Use It is important to recognise that the required reclaimed water quality differs for each intended end use. Therefore, it is important to provide a quality product that is acceptable to 91
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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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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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