Eurobodalla Integrated Water Cycle Management Strategy

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78 Eurobodalla Integrated Water Cycle Management Strategy 8.2 Opportunities for Developing the Local Supply Sources 8.2.1 Roof Water Harvesting In high rainfall areas, it is possible to harvest considerable amounts of roofwater using rainwater tanks. Recovery of roof water is not only a function of rainfall and tank size and roof size, but also a function of water use. The use of rainwater tanks as a supply source and water conservation measure in highly developed urban areas has increased in recent years due to varied water applications and improved installations and technology. In this study the roofwater harvesting using rainwater tanks was modelled as a supplementary source of supply for the mains water. That is, when available, the harvested roof water is used first, with mains water meeting the residual demand. The rainwater tanks installation scenarios analysed included: All new homes (permanent and holiday) All new homes plus 20% of existing homes All new homes plus 40% of existing homes. For each of the above scenarios the harvested roof water was used for the following uses: Garden watering only Garden watering plus toilet flushing Garden watering, toilet flushing and washing machines. Modelling was conducted on an individual allotment basis and as part of the regional scheme. The modelling assumptions, input parameters and the modelling process and outputs, are discussed in detail in the ‘Yield Study Report’ (see appendix G) and the Rainwater Tank appendix (appendix Z) Table 8-4 below presents the percentage of the annual regional demand that can be supplied by the harvested roof water for the various rainwater tanks installation and nominated end use scenarios.
Eurobodalla Integrated Water Cycle Management Strategy Table 8-3 Percentage of Total Regional Demand That Can Be Supplied Through Rainwater Tanks (With No Other Demand Measures) Rainwater Use 5 kL Tank 10 kL Tank 15 kL Tank 20 kL Tank Garden Watering 3% 3% 4% 4% New houses only Garden and Toilet Use 4% 5% 5% 5% (7 430 dwellings) Garden, Toilet and Washing Machines Use 5% 6% 7% 7% New houses and 20% of existing houses (10 120 dwellings) New houses and 40% of existing houses (12 810 dwellings) Rebates Garden Watering 4% 5% 5% 5% Garden and Toilet Use 5% 6% 7% 7% Garden, Toilet and Washing Machines Use 6% 8% 9% 10% Garden Watering 5% 6% 6% 7% Garden and Toilet Use 6% 8% 9% 9% Garden, Toilet and Washing Machines Use 8% 10% 12% 13% Council can consider passing on their capital and operational cost saving to landowners who install rainwater tanks as a rebate (Table 8-4). These calculations, taking into account the saving to Council in capital and operational costs, can be found in Appendix Z. Table 8-4 Proposed Rebates For Rainwater Tank Installation 5 kL 10 kL 20 kL+ Garden use only $470 $640 $735 Garden use plus toilet and/or washing machines $510 $680 $780 Rainwater Tanks In All New Developments Opportunity In this opportunity, 10 kL rainwater tanks could be mandated for all new developments, for garden watering, toilet and washing machine use. This has the potential to reduced the demands of the system by 425 ML/a or 6% of the regional water demands. Rebates could be offered either on installation or through developer contributions. Rainwater Tanks In All New Developments And 20% Of Existing Developments Opportunity In this opportunity, 10 kL rainwater tanks could be mandated for all new developments, for garden watering, toilet and washing machines use. A rebate could also be offered for the installation of rainwater tanks for garden watering into existing developments. An uptake of 20% may be achieved through the requirements to retrofit extensions to existing houses with rainwater tanks. For existing houses rebates could be offered to offset the owner’s cost. The opportunity has the potential to reduce the system demands by 510 ML/a or 7% of total regional demands. 79
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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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9.5 Mogo 9.5.1 Background 140 Eurob
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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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