Scenario 1: Base case: Improvements to the existing raw water transfer system, a new Water Treatment Plant (WTP) and full emergency connection to the regional supply and new WTP
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Secure until 2027. Beyond 2027, restrictions may become more frequent and/or more severe. |
$14,430,000 (weir supply, WTP, emergency supply) |
$4,862,000 (operation of local supply) |
Scenario 2: Off-stream storage: Improvements to the existing raw water transfer system, full emergency connection to the regional supply, construction of a 200 ML off-stream storage and new WTP.
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A 200 ML storage is expected to provide a secure supply until approximately 2060.
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$35,830,000 (weir supply, WTP, emergency supply, 200 ML storage)
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$5,363,000 (operation of local supplies)
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Scenario 3: Permanent connection to Rous County Council regional supply: Mullumbimby would form part of the RCC regional supply network with bulk treated water transferred to the Azalea Street reservoirs.
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The secure yield would be determined by the RCC bulk supply system, as with the remainder of Byron Shire.
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$4,264,000 (weir supply, emergency supply, pipeline duplication)
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$20,910,000 (purchase of water)
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Scenario 4: Supplementary groundwater. Improvements to the existing raw water transfer system, new WTP, full emergency connection to the regional supply, construction of new bores to the south-west of Mullumbimby with raw water transferred either to the weir or the new WTP for treatment and distribution to the township.
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A supplementary groundwater supply with a yield of 1.1 ML/d is expected to provide a secure supply until 2050.
Higher groundwater yields would reduce reliance on the weir supply and increase the security of the groundwater option.
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$18,149,000
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$5,497,000 (operation of local supplies)
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