SITUATION: When a well is pumped, the water level drops.
After several
hours of pumping at a constant rate, it stabilizes itself in a lower
position.
4.
What is this called?
A.
Static level.
B.
Pumping level.
C.
Ground level.
D.
Drawdown.
SITUATION: The distance that the water is lowered by pumping is called
drawdown.
It is the difference between the static level and the pumping
level.
The drawdown in the well, resulting from the pumping, lowers the
water pressure in the well, but the surrounding water-bearing ground retains
its original pressure.
In response to this difference in pressure, water
flows out of the pores of the ground into the well.
5.
What percent is the MAXIMUM drawdown allowed in an Army well?
A.
10.
B.
25.
C.
50.
D.
75.
4-11
QM4912
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