Question

Two wells are drilled 50 m apart in an aquifer which has K = 0.05 cm /s. The original height of the phreatic surface above the aquiclude is 12.2 m. The wells are pumped at a rate of 10 L/s. It is estimated that the effect of the pumping extends a distance of 600 m from the center of the well group. Determine the shape of the drawdown curve. The well diameters are 0.5 m.

Answer #1

**ANSWER : **

Observational wells were drilled in a cone of depression of
artesian (confined) well. The drawdown in the observational wells
at 9 m and 18 m from the center of the well were found to be 12 m
and 10 m, respectively. If the hydraulic conductivity of the
aquifer is 2.5 mm/min and the pumping flow rate from the well is
407 m3/hr
(i) Determine the thickness of the aquifer.
(ii) Find diameter of the well if the drawdown at...

Two monitoring wells are drilled into an aquifer 240 ft apart.
The aquifer is sand with K = 12 ft/d, porosity = 0.23, and
a thickness of 45 ft. Using the data below, determine the hydraulic
gradient, Darcy velocity, and seepage velocity between the two
wells. What direction is water flowing?
well
1
well 2
casing elevation (ft
MSL)
142.34
157.61
depth to water
(ft)
18.04
29.78

A 30 cm well penetrates 45 m below the static water table. After
a long period of pumping at a rate of 1200 lpm, the drawdown in the
wells 20 m and 45 m from the pumped well is found to be 3.8 and 2.4
m respectively. Determine the transmissivity (=K*aquifer width) of
the aquifer. What is the drawdown in the pumped well?

A 25 cm well fully penetrates a confined aquifer of 35 m
thickness and has a permeability of 13.5 m/day When a steady state
discharge of 2400 L/min was being pumped for a long time,
observation well at radial distances of 140 m indicated drawdown of
2.2 m, Find: 1) The transmissivity of the aquifer, 2) The drawdown
at the pumping well, 3) The radius of influence, 4) The drawdown at
30 m from the well

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