A fully penetrating pumping well extracts groundwater from a confined aquifer with a pumping rate of 750 m3/day. The hydraulic conductivity of the aquifer is 10 m/day and the saturated thickness is 50 m. The drawdown of the aquifer from this pumping well is insignificant at a distance of 1000 m from the pumping well. At what distance from the pumping well is the drawdown 10 cm? Assume the hydraulic gradient is negligible in the local area.
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A fully penetrating pumping well extracts groundwater from a confined aquifer with a pumping rate of 750 m3/day. The hydraulic conductivity of the aquifer is 10 m/day and the saturated thickness is 50 m. The drawdown of the aquifer from this pumping well is insignificant at a distance of 1000 m from the pumping well. At what distance from the pumping well is the drawdown 10 cm? Assume the hydraulic gradient is negligible in the local area.
Transmissivity T = 1746.76 gal/min/ft
Hydraulic conductivity = 11.645 gal/min/ft2
Storativity = 0.809
The drawdown on Jenny’s Well by the end of August.
=0.6902 ft.
Observation well situated is 69.7 ft away from the pumping well (which is pumping at the rate of 305 gal/min). The aquifer is confined, and the depth has been measured from well logs and is 150 ft. The data for time (t) and drawdown (s) is given below:
|
t (min) |
s (ft) |
|
0.072 |
0.003 |
|
0.105 |
0.006 |
|
0.155 |
0.012 |
|
0.222 |
0.02 |
|
0.322 |
0.026 |
|
0.472 |
0.03 |
|
0.688 |
0.034 |
|
1.005 |
0.037 |
|
1.472 |
0.041 |
|
2.238 |
0.047 |
|
3.238 |
0.052 |
|
4.738 |
0.062 |
|
6.738 |
0.072 |
|
10.072 |
0.087 |
|
15.905 |
0.107 |
|
21.905 |
0.116 |
|
31.905 |
0.129 |
|
46.905 |
0.149 |
|
67.905 |
0.171 |
|
100.91 |
0.203 |
|
150.91 |
0.239 |
|
220.91 |
0.276 |
|
351.9 |
0.33 |
|
500.9 |
0.36 |
|
687.9 |
0.39 |
|
1001.9 |
0.43 |
|
1481.9 |
0.46 |
|
2202.9 |
0.49 |
|
3103.9 |
0.51 |
|
4336.9 |
0.54 |
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