Water Supply Engineering
The R.L. of ground water table on the sides of a valley is 1505 m whereas R.L. of the stream water is 1475 m. If 60° slope consists of pervious soil between R.L. 1485 m to 1500 m, the gravity spring may be expected at the point of reduced level

1505 m
1475 m
1500 m
1485 m

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Water Supply Engineering
While determining the yield of open wells by the pumping test

Working head is generally limited to ?rd of the critical depression head
Depression head resulting at critical velocity, is called critical depression head
Maximum safe yield of an open well, is expected at critical depression head
Velocity of recharging water, increases with depression head

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Water Supply Engineering
In centrifugal pump installation,

Pump is properly primed before starting
The diameter of the pipe at inlet as well as at outlet, is kept smaller than the delivery pipe
The motor may burn out if it is started with empty delivery pipe and with open gate valve
All listed here

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