Water Supply Engineering
To pump water from a water reservoir 3 m deep and maximum water level at 135 m, a pump is installed to lift water up to R.L. 175 m at a constant rate of 36,00,000 litres per hour. If the length of the pipe is 1506 m and f = 0.01, ignoring other minor losses and assuming the economical diameter from Lea's formula D = 1.2 √Q, the water horse power of the pump is

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

Velocity of recharging water, increases with 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
Working head is generally limited to ?rd of the critical depression head

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