The formation of a valley has a hydraulic conductivity of 400 ft/day and porosity of 0.25. The water table gradient was found to be 1 ft over 1000 ft. using two observation wells. The average depth of water table in the aquifer is 100 ft. (a) Determine the rate of flow per unit width of the aquifer.

The formation of a valley has a hydraulic conductivity of 400 ft/day and porosity of 0.25. The water table gradient was found to be 1 ft over 1000 ft. using two observation wells. The average depth of water table in the aquifer is 100 ft. (a) Determine the rate of flow per unit width of the aquifer.

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter7: Permeability

Section: Chapter Questions

Problem 7.22P: Refer to Figure 7.24. The following data were collected during the field permeability measurement of...

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1. A confined aquifer is recharged by a continuous supply of water from the certain source. The average thickness of the aquifer was determined to be 18 m and the average width is 8 km. The hydraulic conductivity of the aquifer was obtained at 60 m/day and its void ratio is 0.1586. The piezometer heads in two wells 2,145m apart are 128 meters and 188 meters from a common reference datum. Determine: •compute the rate of flow through the aquifer in m3/day •compute the seepage velocity in m/day •compute the time of travel from the head of the aquifer to a point 8 km downstream in days
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The formation of a valley has a hydraulic conductivity of 400 ft/day and porosity of 0.25. The water table gradient was found to be 1 ft over 1000 ft. using two observation wells. The average depth of water table in the aquifer is 100 ft. (a) Determine the rate of flow per unit width of the aquifer. (b) How long it will take the groundwater to travel from the head of valley to the stream bank if the total distance is 1 mile (assume, porosity = 0.25).
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5. From the figure shows an unconfined non homogeneous aquifer between two water bodies at depth of 50 m and 45 m. respectively. Compute the average coefficient of permeability of the aquifer and the rate of flow. K2= 30 m/sec K1= 20 m/sec 50 m 45 m 1000 m 800 m
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
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.
2. An aquifer has a hydraulic conductivity of 180 ft/day, and effective porosity of 33% and is under a hydraulic gradient of 0.0004. a) Compute the Darcy velocity (also called Darcy flux). b) Compute the actual velocity (also known as the average linear velocity). c) The water temperature was 14 Degree C, and the mean pore diameter was 0.30 mm. d) Was it permissible to use Darcy's law under these circumstances? e) What is the reason for your answer?
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7.22
A falling head hydraulic conductivity test is performed on a sample of soil. The standpipe having a diameter 0.2 cm is observed and it takes 60 seconds for the water to drop by 50 cm from an initial hydraulic head of 90 cm. The sample has a length of 20 cm, and a diameter of 4 cm. Solve for the hydraulic gradient. O 1.75 O 1.25 O 2.5 O 1.5