Eurobodalla Integrated Water Cycle Management Strategy

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180 Eurobodalla Integrated Water Cycle Management Strategy Water Cycle Management Opportunities There are both short and medium term measures to improve the water cycle management at Potato Point. The short term measures should be implemented as a matter of priority to achieve best practice standard immaterial of the medium term opportunities. Short Term Measures The short term measures include: Regular monitoring of the on-site wastewater management systems for performance and integrity, Systematic monitoring of local waterways and urban stormwater quality and quantity, Regular mail-outs of ways to maintain on-site wastewater systems including information on water conservation. The above short term measures are complimentary to the proposed medium term measures and would help Council and the community to manage their water cycle more sustainably. Medium to Long Term Water Cycle Management Opportunities Medium term opportunities are measures related to improving the long term sustainability of the water cycle. In addition, these opportunities will also reduce public health and environmental impacts and enhance the service standards for the water services. Table 9-31 presents these opportunities along with their capital and present value at an annual discount rate of 7%. Table 9-31 Integrated Water Cycle Management Opportunities for Potato Point Cost Estimate Capital ($m) NPV @ 7% ($m) Improved management of existing on-site facilities $0.18 $0.96 Enhanced management of existing on-site facilities $0.57 $0.77 Provision of centralised effluent management Provision of full reticulated sewerage system Transfer to Bodalla system Transfer to Bodalla system Transfer to Bodalla STP with greywater reuse and roof water harvesting $1.72 $0.68 $1.9 $0.72 $1.9 $0.72 Note 1: As this is a strategy document, the saving s to Council for greywater reuse have not been costed. This option will incur greater community costs Note: NPV’s for on-site systems are based on a rolling program commencing in 2003. NPV’s for sewering Potato Point are based on work commencing in 2020
Eurobodalla Integrated Water Cycle Management Strategy Improved Management of Existing On-site Wastewater Facilities Sewage is currently treated by on-site systems. 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. 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 divided 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 but 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 tanks 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 of the 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 wastewater from existing on-site 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 solids are captured by the on-site system and the pipes only need to carry liquid wastewater. The wastewater would be transported to Bodalla STP for treatment. Reed beds are local treatment option that may be viable in Potato Point. Constructed Reed beds use passive biological systems to treat a variety of wastes such as human, animal, plant and industrial wastes. It is an extremely effective system with many environmental benefits when compared with traditional treatment options. Provision of Full Reticulated Sewerage System An alternative to treating sewerage on-site is to transfer wastewater (i.e. black and grey water) through a centralised sewer transport network to either a local treatment facility as discussed for the previous opportunity, or to the (proposed) Bodalla STP. Unlike in the previous opportunity the sewer transport pipes would be required to be larger and possibly need to be installed at greater depths. Appendix P provides a detailed description of the available transport and local treatment options. The shortlisted reclaimed water management options are the same as those discussed for the above opportunity. 181
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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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8.3.2 Immediate Measures 84 Eurobod
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9.2 South Durras 9.2.1 Background 1
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