Example 5.2 A 30 cm well penetrates 50 m below the static water table. After a long period of pumping at a rate of 1800 lpm, the drawdowns in the wells at 15 and 45 m from the pumped well were 1.7 and 0.8 m, respectively. Determine the transmissibility of the aquifer. What is the drawdown in the pumped well?

Example 5.2 A 30 cm well penetrates 50 m below the static water table. After a long period of pumping at a rate of 1800 lpm, the drawdowns in the wells at 15 and 45 m from the pumped well were 1.7 and 0.8 m, respectively. Determine the transmissibility of the aquifer. What is the drawdown in the pumped well?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A 30 cm diameter well penetrates vertically through an aquifer to an impermeable stratum which is located 18.0m below the static water table. After a long period of pumping at rate of 1.0m^3/min, the drawdown in test holes 14m and 40m from the pumped well is found to be 2.62m and 1.50m respectively. What is the coefficient of permeability of the aquifer? Express in meters per day. What is its transmissibility? Express in cubic meters per day per meter. What is the drawdown in the pumped well?
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An artesian well has a diameter of 10 cm. Under steady state condition, what is the expected discharge (lps) if the drawdown is 2.5 m and the radius of influence is 120 m? The aquifer's hydraulic conductivity and thickness are 75/day and 4 m, respectively. Please do not solve wrong , in unsure allow others to do it .
Transmissibility
a 30 cm well penetrates an unconfined aquifer of saturated depth 25m. When a discharged of 2100 lpm was being pumped for a long time, observation wells at radial distances of 30 and 90 m indicated drawdown of 5 and 4 m respectively. estimate the coefficient of permeability of the aquifer and the drawdown at drawdown at pumping well.
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D2
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A well of diameter 15 cm pumps at a steady rate of 265 L/min. It is located 15.2 m from a lake shore that is straight. The well and the lake penetrate the same homogeneous isotropic confined aquifer of hydraulic conductivity 2 m/day. At the steady state the influence of a well pumping at the above rate on the aquifer is upto a distance of 50 m from the well. Determine the drop in water level in the well assuming that without the well pumping, the head at the well is essentially the same as the head in the lake
31 Yuri wants to determine the permeability of an aquifer. The aquifer has a test well 300-mm in diameter with two observation wells. A pumping test was conducted for 24 hours with the discharge being held constant at 5,721.4 m^3/day. The first one, 81.07 meters from the test well, has a draw-down of 0.6 meters. The second one, 40 meters from the test well, has a draw-down of 1.43 meters.The static water table penetrates the well to a depth of 25 meters. Determine the radius of influence of the aquifer in meters. Round off to three decimal places.