4. For a confined well with 1000gpd withdrawal the draw dawn from several observation well are given in table below. Calculate the following: (a) Using the Thiem formula, complete the following 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 (c) Compare with the values obtained in parts (a) and (b). 1 (feet) 98.0 2.6 2(feet) 295.0 98.0 295.0 $1(feet) 3.57 7.34 $2(feet) 2.35 3.57 2.35 KB(gpd/t) 7.34 3.57 2.35 7.34 2.6 98.0 295.0 2.6 705.0 0.82 705.0 705 0.82 0.82 Mean kB

4. For a confined well with 1000gpd withdrawal the draw dawn from several observation well are given in table below. Calculate the following: (a) Using the Thiem formula, complete the following 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 (c) Compare with the values obtained in parts (a) and (b). 1 (feet) 98.0 2.6 2(feet) 295.0 98.0 295.0 $1(feet) 3.57 7.34 $2(feet) 2.35 3.57 2.35 KB(gpd/t) 7.34 3.57 2.35 7.34 2.6 98.0 295.0 2.6 705.0 0.82 705.0 705 0.82 0.82 Mean kB

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter8: Seepage

Section: Chapter Questions

Problem 8.11P

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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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