Eurobodalla Integrated Water Cycle Management Strategy

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194 Eurobodalla Integrated Water Cycle Management Strategy There are 1.6 km of stormwater pipes and 7 discharge points in Mystery Bay. There are no permanent streams nearby however 5 of the discharge points discharge directly to intermittent streams and two of these to the Swamp Oak vulnerable ecosystem. An estimated 340 kL/a of stormwater is generated in Mystery Bay, containing 409 kg/a of nitrogen and 55 kg/a of phosphorous. 9.13.2 What Are the Issues? The issues associated with the village landscape and water management system are classified into environmental and social issues, and are discussed below. Other community services related issues are not part of this study. Environmental Issues Risk of sewage overflows from on site systems to sensitive waterbodies, Urban stormwater discharge is impacting on intermittent streams, Clay soils in the area have a low septic adsorption capacity, resulting in the potential contamination of local waterways. Social Issues The current sewage management systems / practices poses a risk to public health, Odour complaints from residents from on site systems, The water supply and wastewater systems are experiencing pressure from population growth, The community relies on the pristine nature of the catchment for its recreational activities. 9.13.3 How Do We Fix The Problems? Water Cycle Management Opportunities There are both short and medium term measures to improve the water cycle management at Mystery Bay. 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 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 after the on-site water and 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.
Eurobodalla Integrated Water Cycle Management Strategy 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 9-39 presents these opportunities along with their capital and present value at an annual discount rate of 7%. Table 9-39 Cost Estimates of Medium to Long Term Water Cycle Management Opportunities for Mystery Bay Cost Estimate Capital ($m) NPV @ 7% ($m) Improved management of existing on-site facilities 0.10 0.56 Enhanced management of existing on-site facilities Centralised management of effluent from on- Local treatment and management 0.446 0.60 2.44 0.74 site facilities Transfer to Kianga system 2.27 0.68 Provision of full reticulated sewerage system Local treatment and management 2.44 0.94 Local treatment and management with greywater reuse 2 2.44 0.94 Transfer to Kianga system 2.45 0.722.1 Note 1: NPV’s for on-site systems are based on a rolling program commencing in 2003. NPV’s for sewering Mystery Bay are based on work commencing in 2021 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 Existing On-site Wastewater Facilities The seepage from existing on-site wastewater management systems could be reduced by regularly emptying the contents of the septic tanks and putting monitoring systems in place 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 split between the residents. To facilitate pumping every tank would need to be provided with a smaller holding tank or pumpout facility. This opportunity would remove the issue of effluent contaminating the aquifer and waterways, but raises community issues in relation to odour during pumpout and frequent 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. 195
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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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