3. A 40-cm confined-aquifer well is pumped for 1440 minutes at 500 gpm. The drawdowns at the pumped well and at three observation wells are the following: Distance from center of pumped well, m Drawdown, m 0.20 8.5 3.0 6.4 30.5 4.6 91.0 3.7 Perform a linear regression on the field-test data and find a) transmissivity T, in m²/min, b) storage coefficient S.

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3. A 40-cm confined-aquifer well is pumped for 1440 minutes at 500 gpm. The drawdowns at the
pumped well and at three observation wells are the following:
Distance from center of pumped well, m
Drawdown, m
0.20
8.5
3.0
6.4
30.5
4.6
91.0
3.7
Perform a linear regression on the field-test data and find
a) transmissivity T, in m²/min,
b) storage coefficient S.
4. Solve problems 3.10 and 3.11 from Shammas and Wang, 3rd. Ed., 2011.
Transcribed Image Text:3. A 40-cm confined-aquifer well is pumped for 1440 minutes at 500 gpm. The drawdowns at the pumped well and at three observation wells are the following: Distance from center of pumped well, m Drawdown, m 0.20 8.5 3.0 6.4 30.5 4.6 91.0 3.7 Perform a linear regression on the field-test data and find a) transmissivity T, in m²/min, b) storage coefficient S. 4. Solve problems 3.10 and 3.11 from Shammas and Wang, 3rd. Ed., 2011.
3.10 Two wells with effective diameters of 36 in. (914 mm)
are located 1,500 ft (457.2 m) apart in an artesian aquifer with
T = 2.5 x 10* gpd/ft (310.45 m/d/m) and S = 4 x 105.
Compute the drawdown at each well when the two wells are
pumped at 500 gpm (2,725 m³/d) for 20 days.
3.11 Suppose it is desired to restrict the drawdown in each of
the wells to 40 ft in Problem 3.10. What will be the correspon-
ding discharges for individual wells?
Transcribed Image Text:3.10 Two wells with effective diameters of 36 in. (914 mm) are located 1,500 ft (457.2 m) apart in an artesian aquifer with T = 2.5 x 10* gpd/ft (310.45 m/d/m) and S = 4 x 105. Compute the drawdown at each well when the two wells are pumped at 500 gpm (2,725 m³/d) for 20 days. 3.11 Suppose it is desired to restrict the drawdown in each of the wells to 40 ft in Problem 3.10. What will be the correspon- ding discharges for individual wells?
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