The bores that already supply water to Clyde and will soon also provide water for Alexandra’s Lake Dunstan Water Supply are located at the edge of Lake Dunstan.
They’re lined with steel pipes and sunk into the ground to a depth of 25 metres, 15 metres below the lake level. Lake water is filtered through gravels before it enters a bore.
Water enters the bores through slots in the bores’ casing. Inside each bore is a submersible pump that pushes water up to a water treatment plant. Each bore can move water at a rate of 100-120 litres per second.
What you can see at the edge of Lake Dunstan is the headworks of the bores—the Clyde Bore and what’s called Bore No.1.
There are four bores on the edge of Lake Dunstan – one is already in use and provides water to Clyde. Bore No.1 is currently only used for testing but it will become part of the Lake Dunstan Water Supply, as will Bore No.3. Bore No.2 has a lower yield and will only be used to supply water if needed.
Below: A diagram of the workings of a bore on the edge of Lake Dunstan.