The steady flow rate Q can be found for a gravity well by using the Dupuit formula:
Q =[1.36K(H 2-h 2)]/log(D/d)
where
Q =flow, gal/day (liter/day)
K= hydraulic conductivity, ft/day (m/day), under
1:1 hydraulic gradient
H= total depth of water from bottom of well to free-water surface before pumping, ft (m)
h= H minus drawdown, ft (m)
D= diameter of circle of influence, ft (m)
d =diameter of well, ft (m)
The steady flow, gal/day (liter/day), from an artesian well is given by
Q=[2.73Kt(H -h)]/log(D/d)
where
t = thickness of confined aquifer, ft (m).
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