Problems An aquifer of 20m average thickness is overlain by an impermeable layer of 30m thickness. A test well of 0.5m diameter and two observation wells at a distance of 10m and 60m from the test well are drilled through the aquifer. After pumping at a rate of 0.1 m³/s for a long time, the following draw downs are stabilized in these wells. First observation well, 4m, second observation well, 3m. Show the arrangement in a diagram. Determine the coefficient of Permeability and the drawdown in the test well.

Problems An aquifer of 20m average thickness is overlain by an impermeable layer of 30m thickness. A test well of 0.5m diameter and two observation wells at a distance of 10m and 60m from the test well are drilled through the aquifer. After pumping at a rate of 0.1 m³/s for a long time, the following draw downs are stabilized in these wells. First observation well, 4m, second observation well, 3m. Show the arrangement in a diagram. Determine the coefficient of Permeability and the drawdown in the test 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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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

Problems
An aquifer of 20m average thickness is overlain by an impermeable layer of 30m thickness. A test
well of 0.5m diameter and two observation wells at a distance of 10m and 60m from the test well
are drilled through the aquifer. After pumping at a rate of 0.1 m³/s for a long time, the following
draw downs are stabilized in these wells. First observation well, 4m, second observation well, 3m.
Show the arrangement in a diagram. Determine the coefficient of Permeability and the
drawdown in the test well.

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Plz explain this example
Answer both 1 (i) and (ii) 1) i) A 6 inch diameter well that fully penetrates a 40ft thick open aquifer is pumped at a rate of 100 gpm. The drawdown in the well is 22ft when a steady water level is established. The drawdown in a well 152ft distant is 12ft. Estimate the coefficient of permeabiliity of the soil deposit. ii) Discuss the validity of the answer obtained in 1( i ) and suggest how would you improve the test data obtained to produce a better value of k. Why?
A pump well is dug through a confined aquifer having a thickness of 32 meters. The piezometric surface of the aquifer is 18 meters measured from the top impermeable layer. The first observation well is 75 feet directly west of the pump well and the second observation well is 75 feet directly north of the first observation well. Determine the hydraulic conductivity of the aquifer if it supplies a discharge of 10 liters per second and the drawdown of the observation wells are 13 feet and 23 feet.
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A permeability pumping test was carried out in a confined aquifer with the piezometric level before pumping of 2.18m below the ground surface. The aquiclude has a thickness of 5.7m measured from the ground surface and confined aquifer is 7.6m deep until it reaches the aquiclude at the bottom. At a steady state pumping rate of 15.6 ?7??6?3/?2h?7??1? the drawdown in the observation wells were respectively equal to 1.62m and 0.47m. The distances of the observation wells from the center of the test well were 15m and 32m respectively. The radius of the test well is 1m. Determine the coefficient of permeability (m/hr) Select the correct response: 2.15x10-5 0.215 0.597 5.97x10-5
A 300 mm diameter test well penetrates 24 m. below the static water table. After 24 hours of pumping at 69 liters per second, the water level in an observation well at a distance of 96 m. from the test well is lowered by 0.60 and the other observation well at a distance of 34 m. from the test well, the drawdown is 1.2 m a) Compute the coefficient of permeability of the unconfined aquifer b) Compute the transmissivity of the unconfined aquifer.
A confined aquifer shown has hydraulic conductivity of 52 m/day with void ratio of 0.282. The average thickness is 30 m and the average width is 4 km. el = 85 m el = 55 m 30 m aquifer 1400 m Determine the nearest value of the time of travel from the head of aquifer to a point 5.2 km downstream in days (in a whole day).
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?
A well was constructed to pump water from a confined aquifer. Two observation wells were constructed at distances of 350 m and 800m respectively. At a steady pumping rate of 0.39 m^3/min, the drawdown in the observation wells were respectively equal to 1.6 m and 7.8 m. Diameter of the test well is 0.95 m and thickness of confined aquifer is 16 m. a. Determine the hydraulic conductivity of the soil in m/min. (IN EXPONENTIAL FORM AND IN 2 DECIMAL PLACES) b. Determine the drawdown at the test well in m. (IN 2 DECIMAL PLACES) c. What is the value of the transmissivity of the confined aquifer in m^2/day? (IN 2 DECIMAL PLACES)
A confined aquifer has a source of recharge. The hydraulic conductivity of the aquifer is 40 m/day and its porosity is 0.25. The piezometric head in the two wells 1000m apart is 65 m and 60 m respectively from a common data. The average thickness of the aquifer is 25 m and the average width is 4 km. Compute the seepage velocity.
Seepage analysis..