Q- 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 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. Find the hydraulic conductivity of the aquifer (in m/day). wwwwwwwwwww

Q- 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 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. Find the hydraulic conductivity of the aquifer (in m/day). wwwwwwwwwww

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 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.
1. A piezometer point is 35 m above mean sea level. The fluid pressure in the aquifer at that point is 6.70 x 10E+6 N/m2. The aquifer has fresh water at a temperature of 15 degree C. a) What is the point water pressure head? b) What is the total head?
What is the pumping rate (in m°/d) required to create a drawdown of 129 mm at 173.7 from the well after 25 days of pumping. The aquifer is confined, and is 42.9 m thick and has a K of 13.8 m/d. Take the specific storage as 1.7E-6 1/m.
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)?
6. In a tube well of 20cm diameter in a soil with coefficient of permeability of 4.15* 10 m/s, drawdown is 4m and aquifer is 30m thick. If radius of influence is 245m, what is the discharge in each well?
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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)?