Water Supply Engineering
Corrosion of well pipes may not be reduced by

reducing the flow velocity
reducing the draw down and the pumping rate
using thicker pipes
using screens having larger area of openings

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

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

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