A tube - well of 20 cm diameter fully penetrates a horizontal, homogenous and isotropic confined aquifer of infinite horizontal extent. The aquifer is of 30 m uniform thickness. steady pumping at the rate of 40 litres/s from the well for a long time results in a steady drawdown of 4 m at the well face. The subsurface flow to the well due to pumping is steady, horizontal and Darcian and the radius of influence of the well is 245 m. The hydraulic conductivity of the aquifer (in m/day, round of to integer) is

A tube - well of 20 cm diameter fully penetrates a horizontal, homogenous and isotropic confined aquifer of infinite horizontal extent. The aquifer is of 30 m uniform thickness. steady pumping at the rate of 40 litres/s from the well for a long time results in a steady drawdown of 4 m at the well face. The subsurface flow to the well due to pumping is steady, horizontal and Darcian and the radius of influence of the well is 245 m. The hydraulic conductivity of the aquifer (in m/day, round of to integer) is

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 single ideal pumping well, with radius of 1.0 ft and flow rate of 155 gpm, exists in an ideal confined aquifer. The aquifer has a saturated thickness of 82 ft. The pump continues running until equilibrium conditions are reached. The drawdown at the pumping well is 42 ft, and the drawdown at an observation well 138 ft away is 7.5 ft. Determine: Find the transmissivity in ft^2/day and hydraulic conductivity in ft^2/day Find the radius of influence in feet.
A well penetrates an unconfined aquifer, with undisturbed water level (ho) equal to 21m. After pumping the well at a constant rate of Q = 0.07 m/s, the steady-state drawdown at distances of 45 m and 110 m from the well are 3 m and 1 m. respectively. Assume the void ratio as 0.2. Compute the hydraulic conductivity of the aquifer. 215.0 m/day what is the porosity 0.16 find the darcy velocity in m/day 69.4 m/day
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4. A confined aquifer of 10-m thickness and 16.43 m/day hydraulic conductivity is fully penetrate by a pumping well of 0.5 m radius operating at Q=425 m³/day. Determine the drawdown under steady-state conditions in a) the pumping well and b) 50 m away from the well. Take the radius of influence of the pumping well as 300 m.
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
A tube-well of 20 cm diameter fully penetrates a horizontal, homogeneous and isotropic confined aquifer of infinite horizontal extent. The aquifer is of 30 m uniform thickness. A steady pumping at the rate of 40 litres/s from the well for a long-time result in a steady drawdown of 4 m at the well face. The subsurface flow to the well due to pumping is steady, horizontal and Darcian and the radius of influence of the well is 245 m. Find the hydraulic conductivity of the aquifer.
7 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 6,481 m^3/day. The first one, 87.94 meters from the test well, has a draw-down of 0.56 meters. The second one, 46 meters from the test well, has a draw-down of 1.25 meters.The static water table penetrates the well to a depth of 28 meters. Determine the radius of influence of the aquifer in meters. Round off to three decimal places.
10 m thick confined aquifer gives the steady state discharge of 0.03 m³/s through the well of 50 cm radius. Due to pumping, the height of water in the well is dropped from 15 m to 10 m and the 939 radius of influence is obtained as 500 m. What is the coefficient of permeability (mm/s)?
2. (a) A well in an aquifer is pumped over a long period at a rate of 0.05 m3 /s under approximate steady-state conditions. The steady-state drawdowns, from the water table level, at two observation wells at 25 m and 50 m from the abstraction well were observed to be 15.3m and 9.5m, respectively. If the saturated thickness of the aquifer prior to pumping is 80 m, determine the hydraulic conductivity of the aquifer material. (b) Will the actual drawdown in the pumping well be more than the theoretical drawdown? If yes, why and what measures can you recommend for reducing the drawdown in the pumping well?
4. A confined horizontal aquifer of 20 m thickness and permeability K = 22 m/day, connects two reservoirs M and N situated 2 km apart. The elevations of the water surface in the reservoirs M and N measured from the top of aquifer are 30 m & 10 m respectively. If the reservoir M is polluted by a contaminant suddenly, how long will it take the contaminant to reach the reservoir. N. Assume the porosity of aquifer n=0.26
An unconfined aquifer is known to be 32 m thick below the water table. A constant discharge of 2 cubic metres per minute is pumped out of the aquifer through a tubewell till the water level in the tubewell becomes steady. Two observation wells at distances of 15 m and 70 m from the tubewell show falls of 3 m and 0.7 m respectively from their static water levels. Find the permeability in mm/s of the aquifer.
10 m thick confined aquifer gives the steady state discharge of 0.03 m³/s through the well of 50 cm radius. Due to pumping, the height of water in the well is dropped from 15 m to 10 m and the 939 radius of influence is obtained as 500 m. What is the coefficient of permeability (mm/s)?