Eurobodalla Integrated Water Cycle Management Strategy

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146 Eurobodalla Integrated Water Cycle Management Strategy 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. This opportunity would reduce the issue of wastewater contaminating the local aquifers and waterways, but may lead to additional community issues in relation to odour and noise 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 wastewater 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 (e.g. aerated tanks) and therefore results in a higher quality wastewater discharge. This would increase the potential uses of the treated wastewater. The enhanced management of the current on-site systems would minimise the potential risk of pollution contaminating the lagoons and waterways 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 a conventional gravity system, 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 Tomakin STP for treatment. Provision of Full Reticulated Sewerage System An alternative to on-site sewerage treatment facilities is to transfer wastewater through a centralised sewer transport network to Tomakin STP. This opportunity would require the provision of larger pipes than for the previous option, which would possibly require being installed at greater depths. Provision of Full Reticulated Sewerage System with Grey Water Reuse On-site systems that achieve a suitable level of treatment for greywater would be maintained, and blackwater only would be transported to the STP using the reticulation systems described above. The resulting greywater could then be utilised for a variety of outdoor uses and for toilet flushing. Maintaining current aerated systems in Rosedale and Guerilla Bay for greywater reuse would reduce the volume of wastewater requiring treatment by 4 ML/a. In addition to reducing the volume of imported or reticulated water required for Rosedale and Guerilla Bay, this would reduce the hydraulic load on the Tomakin STP. With the implementation of appropriate monitoring systems, long term environmental and water resource sustainability and public health protection could be achieved. Provision of Full Reticulated Sewerage System with Grey Water Reuse and Roofwater Harvesting This opportunity incorporates components of the previous opportunity. Systems that are not suitable for greywater reuse (e.g. septic tanks) would be de-sludged and disinfected and used to collect roofwater for non-potable uses including garden watering and toilet flushing.
Eurobodalla Integrated Water Cycle Management Strategy This would result in an additional 9.32 ML/a of wastewater not requiring transportation and treatment at the Tomakin STP. Together with greywater reuse from aerated systems, a total of 13.32 ML/a could be saved. Social and Environmental Aspects of Medium to Long term Water Cycle Management Opportunities The TBL assessment in Table 9-16 provides the comparative environmental and social benefits of each of the water cycle management opportunities. Table 9-16 Social and Environmental Aspects of the Medium to Long term Opportunities for Rosedale and Guerilla Bay Opportunities Social Environmental Improved management of existing onsite facilities Enhanced management of existing onsite facilities Centralised management of effluent from onsite facilities Transfer to Tomakin system Associated odour and noise impacts Inconvenience of pumpout trucks in the area Reduces likelihood of overflows from on-site systems Improves air quality and visual character Enhances aesthetic appeal for the local area, good for tourism and recreational activities Reduces likelihood of overflows from on-site systems Limited additional treatment infrastructure required Existing resources can be utilised Short term inconvenience for residents during construction, i.e. noise, vehicle movement Improves air quality and visual character Improves environmental outcomes, minimises the incidence of septic wastewater contaminating groundwater and waterways Reduces impact to local aquifers and the environment Possible environmental impact during construction Less overall environmental impacts than conventional gravity systems May allow for regional reuse 147
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xviii TABLES Eurobodalla Integrated
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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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9.14.2 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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216 ML/a Eurobodalla Integrated Wat
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228 SCENARIO 1 Regional Water Suppl
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