Environmental Engineering
The method of analysis of distribution system in which the domestic supply is neglected and fire demand is considered is

Equivalent pipe method
Circle method
Hardy cross method
Electrical analysis method

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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 summit of rising mains
At street corners to control the flow of water
At every depression and dead ends to drain out the waste water that may collect there

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