Page 188 - Water and wastewater engineering

WELLS 4-43

4-3. Determine the transmissivity of a confined aquifer that yields the following results
from a pumping test of a 0.46 m diameter well that fully penetrates the aquifer.
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Pumping rate 0.0076 m /s
s 3.00 m in 0.10 min
s 34.0 m in 1.00 min
4-4. An aquifer yields a drawdown of 1.04 m at an observation well 96.93 m from a well
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pumping at 0.0170 m /s after 80 min of pumping. The virtual time is 0.6 min and the
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transmissivity is 5.39 10 m /s. Determine the storage coefficient.
4-5. Using the data from Problem 4-4, find the drawdown at the observation well 80 days
after pumping begins.
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4-6. If the transmissivity is 2.51 10 m /s and the storage coefficient is 2.86 10 ,
calculate the drawdown that will result at the end of two days of pumping a 0.50 m
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diameter well at a rate of 0.0194 m /s.
4-7. Determine the storage coefficient for an artesian aquifer from the pumping test
results shown in the table below. The measurements were made at an observation
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well 300.00 m away from the pumping well. The pumping rate was 0.0350 m /s.
Time (min) Drawdown (m)
100.0 3.10
500.0 4.70
1,700.0 5.90
4-8. Rework Problem 4-7, but assume that the data were obtained at an observation well
100.0 m away from the pumping well.
4-9. Determine the storage coefficient for an artesian aquifer from the pumping test
results shown in the table below. The measurements were made at an observation
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well 100.00 m away from the pumping well. The pumping rate was 0.0221 m /s.
Time (min) Drawdown (m)

10.0 1.35
100.0 3.65
1,440.0 6.30

4-10. Rework Problem 4-9, but assume that the data were obtained at an observation well
60.0 m away from the pumping well.

4-11. Determine the storage coefficient for an artesian aquifer from the following pumping
test results on a 0.76 m diameter well that fully penetrates the aquifer. The pumping
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rate was 0.00350 m /s. The drawdowns were measured in the pumping well.
Time (min) Drawdown (m)
0.20 2.00
1.80 3.70
10.0 5.00