A leaky confined aquifer is overlain with unconfined aquifer. The estimated recharge rate fromthe aquifer is 0.085 m/year), the average head in the aquifer is (6.8 m) and the thickness of theaquifer is (4.3 m).calculate the vertical hydraulic conductivity of the aquifer.

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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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An unconfined aquifer consists of three horizontal layers ,each individually isotropic.the top layer has a thickness of 10m and a hydraulic conductivity of 11.6 m/day. The middle layer has a thickness of 6.2 m and a hydraulic conductivity of 2.2 m/day . Compute the equivalent horizontal and vertical hydraulic conductivity.
A well in an unconfined aquifer is pumped at the rate of 50 L/s ( 800 gal/min.). The thickness of the aquifer is 30 m. and the elevation of the phreatic surface is 25 m. above the underlying aquiclude at an observation of well 20 m away from the well and 34.6 m above at a well 50 m. away. What is the value of K for this aquifer?
The hydraulic conductivity of an aquifer is 0.002 cm/sec, the hydraulic gradient is 0.004, and the porosity is 0.3. The aquifer is 5 meters thick (b). What it is its transmissivity (T) in cm2 / sec. ? Enter your answer to the nearest tenth.
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.
What is the specific capacity of the aquifer shown below in gal / ft / day if the aquifer has reached steady - state , the well diameter is 1 ft , the water table elevation at the well is 12 ft the aquifer recovers its original thickness of 15 ft at ft from the well , and the hydraulic conductivity of the aquifer is 1, 000; 3*10-5 ft/s?
An unconfined aquifer is 10 m thick and is being pumped so that one observation well placed at a distance 76 m shows a drawdown of 0.5 m. On the opposite side of the extraction well is another observation well 100 m from the extraction well, shows a drawdown of 0.3 m. Assume the coefficient of permeability of 50 m/day. a.) What is the discharge f the extraction well? b.) Suppose the well at 100 m from the extraction well is now pumped. Show with a sketch what this will do to the drawdown. c.) Suppose the aquifer sits on an aquaclude that has a slope of 1/100. Show with a sketch what this will do to the drawdown.
(b) | A 400 mm diameter well fully penetrates a confined aquifer of thickness 20 m is pumped at a constant rate of 2500 m/day. The drawdown in the pumping well is observed as 4 m and the radius of influence is at a distance of 100 m. (i) Calculate the transmissivity of the aquifer; (ii) Determine the hydraulic conductivity of the aquifer material and draw the neat sketch of the well
A confined aquifer is 50 m thick and 0.5 km wide. Two observation wells are located 1.4 km apart in the direction of flow. Head in well No. 1 is 50m and in well No. 2 is 42m. Hydraulic conductivity is 0.7 m/day. Effective porosity is 25%. A ship carrying chemicals sank near the observation well no 1 and chemicals somehow reach the groundwater. How long it will take forthe chemicals to reach Well no 2?
A confined aquifer is 50 m thick and 0.5 km wide. Two observation wells are located 1.4 km apart in the direction of flow. Head in well A is 50,0 m and in well B is 42 m. Hydraulic conductivity K is 0.7 m/day. What is the total daily flow of water through the aquifer? (m^3)
An unconfined aquifer is 100 feet thick was evaluated using a field pumping test. The depth to groundwater is 10 feet. At a distance of 1000 feet, the drawdown was 40 feet, and at a distance of 5000 feet it was 20 feet. Find the permeability of the aquifer assuming that a steady-state of 960 gal/minute during the test in ft/sec.
Q4 (a) A confined stratified aquifer has a total thickness of 22 m and is made up of three layers. The bottom layer has a coefficient of permeability of 12 m/day and a thickness of 6.0 m. The middle and top layers have permeability of 14 m/day and 20 m/day respectively and are of equal thickness. Calculate the following: (i) Equivalent hydraulic conductivity (kp(eq), if the flow is perpendicular to the stratification. (ii) Equivalent hydraulic conductivity (kn(eg)), if the flow is parallel to the stratification. (ii) Ratio of equivalent hydraulic conductivities.

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A leaky confined aquifer is overlain with unconfined aquifer. The estimated recharge rate from the aquifer is 0.085 m/year), the average head in the aquifer is (6.8 m) and the thickness of the aquifer is (4.3 m).calculate the vertical hydraulic conductivity of the aquifer.