A dam blocks water in a river or a stream so it must pass over a barrier.
Dams are built across a stream or an estuary to retain water.
Most Dams are multi purpose. They prevent flooding. Dams help to generate
electricity.
electricity.
Water care operates 14 supply reservoirs. Five of them are in Waitakere
Ranges, two of them are near Helensville, four are in Hunua Ranges and 1 in
Papakura.
Ranges, two of them are near Helensville, four are in Hunua Ranges and 1 in
Papakura.
The dams supply 80% of Auckland’s water. They are built with earth and rock.
The water treatment plants are used to clean the water.
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