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 multipurpose and they prevent flooding. Dams help togenerate electricity. Water Care operates 14 supply reservoirs, 5 of them are at Waitakere Ranges, two are near Helensville and four are in the Hunua Ranges and one is east of Papakura. The dams supply 80 % of Auckland's water. After World War 2, they were built with earth and rock. The water treatment plants are used to clean the water.
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