Eurobodalla Integrated Water Cycle Management Strategy

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160 Eurobodalla Integrated Water Cycle Management Strategy The UV disinfection process has been upgraded to tertiary lagoons and an effluent balance tank with overflow to the storm catch ponds. The plant can treat three times average dry weather flow. The current average dry weather flow is 600 kL/d. This is expected to increase to 1 090 kL/d when all Moruya Head properties are connected. Reclaimed water is currently being used for the irrigation of golf course. The remaining treated water is discharged to Ryans Creek. A pollution reduction program has been issued by the EPA to investigate the long term sustainability of the discharge to the estuary. Council is planning to sewer the industrial estate to the north of Moruya. Moruya is estimated to generate 6 413 kL/a stormwater with loadings of 5 350 kg/a of nitrogen and 700 kg/a phosphorous. The urban centres contribute 8.3% of the total nitrogen and 25.3% of the total phosphorous load to the system. This load is expected to increase by 40% over the next 25 years. Appropriate management of stormwater quality is required to reduce this impact. 9.8.2 What Are the Issues? The issues associated with the landscape and water management systems can be classified into environmental, social and water infrastructure performance. These issues are discussed below. Environmental and Social Issues Flood waters from the Moruya River inflow into the sewers increasing the potential of sewer overflows and the associated health risks. There is a pollution reduction program on the STP to investigate the effects of nutrient loads on the estuary Stormwater from Moruya is adversely impacting on the water quality in the estuary. Moruya River is stressed under low flows due to town water and irrigation extractions. Localised flooding occurs in low lying areas. The community perceives that the disposal of sewage effluent into the estuary has a potential health risk to oyster growers and recreational users. Farmers located in the Moruya catchment lack access to freshwater resources and this is adversely affecting their productivity. Water Infrastructure Performance Issues Water Supply An analysis of the reservoirs indicates that there is sufficient capacity to supply the year 2032 peak day demands. Sewage Available data suggests that pump stations 1,2,3,4,5,6 and 7 require upgrading to minimise overflows and odour.
Eurobodalla Integrated Water Cycle Management Strategy 9.8.3 How Do We Fix These Issues? Overview The landscape of this 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 and development control plans. There are a number of opportunities available to manage the water cycle of Moruya and South Heads. Traditionally all opportunities available for the water supply, wastewater and stormwater were often evaluated in isolation. In this strategy, all available opportunities were 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. Short term Measures The short term measures include: Expanding the simple data management system into a comprehensive Shire wide system that is able 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. Underway Medium to Long term Water Cycle Management Opportunities The medium to long term opportunities are related to enhancing the sustainability of the water cycle, protecting the public health and environment and improving the service standards. Table 9-23 presents the water cycle management opportunities, their relative capital and present value costs over a 30-year period at an annual discount rate of 7%. Whilst the costs are indicative only, the relative cost difference between the opportunities should be similar. 161
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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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214 ML/a 8000 7000 6000 5000 4000 3
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228 SCENARIO 1 Regional Water Suppl
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