Environmental Engineering
The commonly used material for water supply pipes, which has the properties of being strong, not easily corroded and long life but is heavy and brittle, is

Cast iron
Steel
Copper
Reinforced cement concrete

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Environmental Engineering
Scour valves are provided

At the foot of rising main along the slope to prevent back running of water
At every depression and dead ends to drain out the waste water that may collect there
At street corners to control the flow of water
At every summit of rising mains

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