Eurobodalla Integrated Water Cycle Management Strategy

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9.14.2 What are the Issues? 202 Eurobodalla Integrated Water Cycle Management Strategy The issues associated with the village landscape and water management system are classified into environmental and social issues, and are discussed below. Other community issues are not part of this study. Environmental Issues An estimated 120 kL/a of stormwater is generated in Central Tilba and Tilba Tilba, containing 145 kg/a of nitrogen and 20kg/a of phosphorous. The villages are located on granite and basalt, resulting in poor adsorption of septic effluent. Social Issues There are potential public health risks associated with the current on-site wastewater management systems, particularly during rainy periods. At present, pump outs are causing public nuisance (odours) and disruptions. The villages are historic and hence a popular tourist area. The amenity of this area should not be diminished and as a result the community favours sewering of the villages to maximise the economic potential of tourism. The village residents do not receive water saving ‘tips’ and information on how to better manage on-site wastewater management systems. 9.14.3 How Do We Fix the Problems? Overview Tilba Tilba and Central Tilba contain lots sizes that are less than the recommended size for sustainable land application and current pump-out arrangements pose social issues. To address the issue of effluent disposal, the village could be sewered. There is the possibility of agricultural re-use and the level of nutrient removal required will dictate if current on-site treatments could be conveyed from the villages, disinfected and re-used or if further off-site treatment is required. Water Cycle Management Opportunities There are both short term and medium term measures to improve the water cycle management at Central Tilba and Tilba Tilba. The short term measures could be implemented as a matter of priority to achieve best practice standard 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. 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 9-43 presents these opportunities along with their capital and present value at a rate of 7%. Table 9-43 Integrated Water Cycle Management Options for Central Tilba and Tilba Tilba Cost Estimate Capital ($m) NPV @ 7% ($m) Improved management of existing on-site facilities 0.060 0.327 Enhanced management of existing on-site 1 0.22 0.29 facilities Centralised management of effluent from on-site 1 1.91 0.93 facilities with agricultural reuse Provision of sewerage system with package plant 1 1.94 0.95 with agricultural reuse 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 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. This however may not be a viable option in Central Tilba and Tilba Tilba due to the step gradient of the landscape and the high percentage of rock. 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 environmental degradation as well as reducing the likelihood of public health issues and odour complaints. 203
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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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Eurobodalla Integrated Water Cycle Management Strategy

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