Civil Engineering Reference
In-Depth Information
Fig. 8-19.
Horizontal collector well (Reprinted from
Journal AWWA,
Vol. 71, No. 10 (October
1979), by permission. Copyright 1979, American Water Works Association)
to the water system by vertical turbine pumps hung in the caisson. The hydraulic head
differential created between the river water surface and the water level in the caisson
draws water through the riverbed material to the slotted pipes of the collector well.
The advantage of this system is that it provides a very large intake area through which
to draw water, much more than can be obtained from a single vertical well. However,
collector wells are more expensive than a single vertical well.
Well Yield
The specific yield of a well is the discharge per foot of drawdown. The safe yield is
the capacity of the aquifer to supply water without a continuous lowering of the water
table or piezometric surface.
