4. For a confined well with 1000gpd withdrawal the draw dawn from several observation well was given in table below. Calculate the following: (a) Using the Thiem formula, complete the table; (b) On semi-log graph paper, plot the final draw-down for each observation well with the log distance from the pumping well. Draw the best fitting line through the four points and obtain the rate of draw-down per log cycle Then obtain the transmissivity value using Thiem equation and finally compare with the values obtained in parts (a) and (b). r₁ (feet) r2(feet) s2(feet) kB(gpd/ft) $₁(feet) 3.57 295.0 98.0 7.34 7.34 3.57 2.35 7.34 98.0 2.6 2.6 98.0 295.0 2.6 295.0 705.0 705.0 705 2.35 3.57 2.35 0.82 0.82 0.82 Mean kB
4. For a confined well with 1000gpd withdrawal the draw dawn from several observation well was given in table below. Calculate the following: (a) Using the Thiem formula, complete the table; (b) On semi-log graph paper, plot the final draw-down for each observation well with the log distance from the pumping well. Draw the best fitting line through the four points and obtain the rate of draw-down per log cycle Then obtain the transmissivity value using Thiem equation and finally compare with the values obtained in parts (a) and (b). r₁ (feet) r2(feet) s2(feet) kB(gpd/ft) $₁(feet) 3.57 295.0 98.0 7.34 7.34 3.57 2.35 7.34 98.0 2.6 2.6 98.0 295.0 2.6 295.0 705.0 705.0 705 2.35 3.57 2.35 0.82 0.82 0.82 Mean kB
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:4. For a confined well with 1000gpd withdrawal the draw dawn from several observation well was given in table
below. Calculate the following: (a) Using the Thiem formula, complete the table; (b) On semi-log graph paper,
plot the final draw-down for each observation well with the log distance from the pumping well. Draw the best
fitting line through the four points and obtain the rate of draw-down per log cycle Then obtain the transmissivity
value using Thiem equation and finally compare with the values obtained in parts (a) and (b).
r₁ (feet)
r2(feet)
s2(feet)
kB(gpd/ft)
$₁(feet)
3.57
295.0
98.0
7.34
7.34
3.57
2.35
7.34
98.0
2.6
2.6
98.0
295.0
2.6
295.0
705.0
705.0
705
2.35
3.57
2.35
0.82
0.82
0.82
Mean kB
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