Eurobodalla Integrated Water Cycle Management Strategy

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120 Eurobodalla Integrated Water Cycle Management Strategy Table 9-5 Integrated Water Cycle Management Opportunities for Nelligen Cost Estimate Capital ($m) NPV @ 7% ($m) Improved management of existing water supply - 0.06 Harvested roof water supplemented with reticulated water from the regional scheme Provision of full reticulated water system from the regional scheme 1.5 1.7 1.7 1.9 Improved management of existing on-site facilities 0.18 0.96 Enhanced management of existing on-site facilities 1 0.46 0.61 Centralised management of effluent from on-site facilities with 1 2.83 1.10 local treatment Local treatment and management 1 2.89 1.254 Transfer to Batemans Bay system 1 Provision of full reticulated sewerage 1.55 0.27 system Transfer to Batemans Bay system 2 with greywater reuse 1.55 0.27 Note 1: NPV’s for on-site systems are based on a rolling program commencing in 2003. NPV’s for sewering Nelligen are based on work commencing in 2012. NPV’s for water are based on works commencing in 2003 Note 2: The savings achieved by Council treating less effluent have not been taken take into account in the study and the costs associated with greywater reuse are community costs Improved Management of Present Water Supply The reliability of the existing rainwater tank supply could be improved by conserving water through more efficient use. Utilising water efficient appliances and fixtures such as dual flush toilet, aerated taps, smart and efficient shower roses and washing machines are a few examples. Harvested Roof Water Supplemented with Reticulated Water Nelligen is totally dependent upon rainwater tanks for its water supply. Installing a reticulated system to supplement rainwater supplies would increase the water security. This type of system would offer a good quality potable water supply whilst continuing to utilise rainwater tanks for uses such as toilet flushing, washing machines and gardening. Significant community and health benefits would be expected with a supplemented potable supply meeting the Australian Drinking Water Guidelines. The reticulated water could be sourced from the regional scheme. This option would also increase security and eliminate the need to import water in periods of low rainfall. The pipes required for a supplemented reticulation scheme would be smaller than for a full reticulated water supply provision. In this case the average annual and peak reticulated water demands for the full development situation would be about 24 ML/a and 0.13 ML/d respectively. Provision of Full Reticulated Water Supply Rainwater tanks can be less reliable than town water supplies and if gutters, roof surfaces and tanks are not well maintained they may result in poor quality water. A full reticulated town water supply with no rainwater tanks would significantly reduce public health risks through ensuring that the water supply meets the Australian Drinking Water Quality Guidelines. This option would also eliminate the need for homeowners to import water during low rainfall and drought periods.
Eurobodalla Integrated Water Cycle Management Strategy Connecting Nelligen to the region’s water supply from Batemans Bay would require a pipe extension of 7.2 km from Batemans Bay along the existing road line. The average annual and peak reticulated water demands for the full development situation would be about 28 ML/a and 0.20 ML/d respectively. The scheme facilities necessary to provide a full reticulated water supply to Nelligen would be similar to those required for a supplemented reticulated supply as discussed previously. The facility and component sizes will, however, need to be slightly larger. The provision of larger pipes and facilities enables the provision of fire fighting services at minimal extra cost. Improved Management of Existing On-site Wastewater Facilities Sewage in Nelligen is currently treated by on-site systems. It is recommended that Council consider the management options for sewage treatment for the village. The seepage from existing on-site wastewater management systems could be reduced by regularly emptying the contents of the septic tanks and installing monitoring systems to prevent septic tank overflows and to assess the integrity of the tanks. Regular pumpouts and monitoring have the potential to minimise many of the environmental and public health impacts associated with the operation of septic systems. A single contract could be arranged by the Council or by the community such that the septic tanks are pumped at set time intervals. This would cover both effluent and sullage pumpout. The cost of this pumpout could be evenly split between the residents. To facilitate pumping every tank would require a smaller holding tank or pumpout facility. Although this opportunity would reduce the potential of waterway and aquifer contamination, it may result in additional community impacts, such as odour complaints associated with pumpouts and the movement of trucks in the neighbourhood. Enhanced Management of Existing On-site Wastewater Facilities There are several options available to upgrade the existing on-site wastewater management systems to achieve greater public health and environmental outcomes. The first option is to retain the existing septic tank and upgrade the on-site effluent management system. An example of this would be the replacement of the adsorption trenches with lined evapotranspiration beds, which achieve a higher level of water and nutrient uptake through plants. Another alternative is to upgrade the septic system to one that achieves nutrient removal and therefore results in a higher quality effluent discharge (e.g. aerated tanks). This would increase the potential uses available to the resulting treated effluent. Both these options would minimise the potential of groundwater contamination and its associated environmental problems, as well as reducing the likelihood of public health issues and odour complaints. Centralised Management of Effluent from On-site Facilities As an alternative to providing a full reticulated sewage system, the effluent from existing onsite systems (e.g. septic tanks) could be collected and transported to a central treatment facility. This type of system relies on smaller pipes than those required for a conventional reticulated sewerage system. Pipes can be laid in the ground at a lesser gradient and at a more shallow depth than that of conventional gravity sewerage, as the pipes carry only entrained solids thus having minimal self-cleaning velocity requirements. The effluent could be treated locally or transported to Batemans Bay STP. Appendix P provides information on the various effluent transport and local treatment options. 121
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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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48 Demand ML/a Eurobodalla Integrat
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6.5.3 Stormwater Issues 58 Euroboda
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9.14.2 What are the Issues? 202 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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