Eurobodalla Integrated Water Cycle Management Strategy

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154 Eurobodalla Integrated Water Cycle Management Strategy There is a need to sustainably manage the use of the Broulee aquifer for continued use by both the environment and the water users. Water Infrastructure Performance Issues Water Supply Analysis indicates that the existing local reservoir capacity meets Council’s service level for current and future demands. Council has advised that under current demand conditions the system also meets Council’s service level for mains pressure and fire fighting requirements. Some residents use groundwater for garden watering. Based on past water quality data, the practice poses a minor risk to the users however over-use of this resource poses a threat to the environment. Measures should be taken to ensure this source is sustainably managed for continued use by the environment and the householders. Sewage The nominal design capacity of the plant will be exceeded by around 2015, however the reactor and the clarifier has been assessed to have a treatment capability in excess of 3.7 ML/d or 15 000 EP. This means the plant has the capacity to process loads for the next 30+ years, provided the pipeline linking the various treatment process units is adequate. However, the plant needs some rehabilitation works to meet current OH&S legislation. It is important to note that if the option to transfer sewage from the southern catchment of Batemans Bay to Tomakin STP is implemented, the Tomakin STP would require increased capacity to be implemented in 2-3 years time, rather than 15 years as indicated earlier. The sewer network servicing Tomakin and the surrounding area is extensive and has been grouped into three distinct catchments, the southern catchment serving the Broulee area, the central catchment covering the Mossy Point area, and the northern catchment covering the Tomakin area. There are six pumping stations in Broulee located along the bay foreshore that transfer the sewage towards the treatment plant. There are three pumping stations in Mossy Point and a major station that receives the sewage generated from both the local and Broulee catchments. The sewage from the main pump station is transferred to a main pumping station in the Tomakin catchment, which together with the local flows transfers the sewage to the STP. Due to its relative recent construction and the lower than anticipated load, the sewer network has been performing satisfactorily during and after power failure and during rainy periods. Due to the long transport network, high levels of hydrogen sulfide are generated causing odours and impacting on the life of the assets. In view of the proximity of the main transport link to the surrounding beaches, it is suggested Council undertake a comprehensive risk analysis to identify potential failure modes and the critical facilities in the network system. This analysis could then be used to develop critical control and management response plans. Although the EPA has assessed the performance of the outfall as being among the best in NSW, in order to meet best practice standards Council should consider disinfecting the wastewater prior to its discharge to the ocean environment. This, in addition to meeting best practice standards, would also provide increased public health protection and improve the aesthetic and environmental appeal of the area. Similar to the Batemans Bay system, options available to enhance the discharge quality include wetland treatment, air flotation and sand or membrane filtration. Reclaimed water reuse and recycling strategies are discussed in Section 3. Stormwater The Barlings Beach sub-catchment encompasses vulnerable ecosystems and a significant wetland that will need protection when development occurs. The main road that leads into
Eurobodalla Integrated Water Cycle Management Strategy the residential areas requires some structural solutions to improve water quality. An estimated 7.92 ML/a of stormwater is generated in Tomakin and the surrounding area annually, containing 7 400 kg/a of nitrogen and 1 000 kg/a of phosphorus. Candlagan Creek is a priority catchment for stormwater management. 9.7.3 How Do We Fix these Issues? Overview The landscape of the Tomakin region could be managed sustainably through the implementation of the appropriate planning controls. The issues of future development and acid sulfate soil runoff could be managed by amending the local environmental plan and development control plans. There are a number of opportunities to manage the water cycle of Tomakin and the surrounding natural and urban landscapes. The opportunities available for stormwater, wastewater and water supply were traditionally examined individually. In this strategy, all available opportunities have been identified and coarse screened (see Appendix C). The coarse screening process recognises that there are immediate and short term measures, and medium to long term water cycle management opportunities. The immediate and short term measures need to be implemented as a matter of priority to achieve legislative compliance and best practice standards. The short-listed medium to long term water cycle management opportunities would in the long run deliver water cycle sustainability, public health protection and improved service standards. Immediate Measures Investigations carried out by Council and as part of this study have identified the following immediate measures, which include: A risk assessment of the sewerage system to identify critical facilities and to develop mitigative measures and critical control and response management plans. Developing a storm water inflow and groundwater infiltration strategy. Short term Measures The short term measures include: Expanding the simple data management system into a comprehensive Shire wide system to record and store operational and performance monitoring information. Initiating regular and systematic monitoring of the operational parameters such as daily water use, sewage flows, water quality etc and more strategic environmental and social parameters. Establishing a water supply reticulation network model to confirm pressure and firefighting service standards. Updating the asset registers to ensure the asset information is complete and up to date. Addition of a UV treatment plant for disinfecting the reclaimed water. Odour and hydrogen sulfide control. 155
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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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214 ML/a 8000 7000 6000 5000 4000 3
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228 SCENARIO 1 Regional Water Suppl
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