Overview
The system consists of 21 bores within the Anna Bay, Glovers Hill and Nelson Bay sandbeds. Extracted water is treated at the Anna Bay and Glovers Hill Water Treatment Plants, each with a capacity to treat and deliver up to 12 megalitres per day.
The sustainable yield of the sandbed system is estimated to be around 7.0 megalitres per day over the longer term. The aquifer can, however, be used to supply much higher flow rates to meet peak day demands, provided that average extraction is kept at or below the sustainable yield. To compensate for high pumping rates in peak periods, treatment rates at the water treatment plants are reduced in non- peak periods. A valve in the bore fields splits the supply system in two. The Anna Bay bores pump water to the Anna Bay Treatment Plant whilst the Fingal Bores and Nelson Bay Bores pump water to the Glovers Hill Water Treatment Plant.
The Anna Bay bores deliver water to the Anna Bay Water Treatment Plant. They generally operate with a delivery pressure of around 10-20 metres. The Anna Bay bores are located in a deep sand aquifer. The capacity of some bores is currently constrained by screen diameter and length, and/or by installed pump capacity.
