A tube-well of 20 cm of diameter fully penetrate a horizontal, homogeneous and isotropicconfined 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 results in asteady drawdown of 4 m at the well face. The subsurface flow to the well due to pumpingis steady, horizontal and Darcian and the radius of influence of the well is 245 m. Thehydraulic conductivity of the aquifer (in m/day, round off to integer) is

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A tube-well of 20 cm of diameter fully penetrate a horizontal, confined aquifer of infinite horizontal extent. The aquifer is A steady pumping at the rate of 40 litres/s from the well steady drawdown of 4 m at the well face. The subsurface flo

A tube-well of 20 cm of diameter fully penetrate a horizontal, confined aquifer of infinite horizontal extent. The aquifer is A steady pumping at the rate of 40 litres/s from the well steady drawdown of 4 m at the well face. The subsurface flo

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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Concept explainers

Groundwater Flow

The term groundwater refers to the water which is found beneath the earth's surface. Pores present in the soil and rocks with fractures make a passage for rainwater to enter the earth's surface and deposit as groundwater. The flow nature and direction of groundwater under the earth's surface directly impacts the strength and compressibility of the soil, which reflects its ability to support structural loads.

Question

A tube-well of 20 cm of diameter fully penetrate 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 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 off to integer) is

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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.
At a hydraulic jump, the depths at its two sides are 0.3 m and 1.2 m. The head loss in the jump is
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.