Water flows in a confined aquifer from a fully penetrating river with a piezometric head of 12m towards a river with a piezometric head of 10m located 400 away. If the aquifer hydraulic conductivity and effective porosity are 3m/day and 0.15 respectively, estimate the seepage velocity in the aquifer Determine the drawdown and piezometric head 150m from an upstream river.

Water flows in a confined aquifer from a fully penetrating river with a piezometric head of 12m towards a river with a piezometric head of 10m located 400 away. If the aquifer hydraulic conductivity and effective porosity are 3m/day and 0.15 respectively, estimate the seepage velocity in the aquifer Determine the drawdown and piezometric head 150m from an upstream river.

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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Water flows in a confined aquifer from a fully penetrating river with a piezometric head of 12m towards a river with a piezometric head of 10m located 400 away. If the aquifer hydraulic conductivity and effective porosity are 3m/day and 0.15 respectively, estimate the seepage velocity in the aquifer Determine the drawdown and piezometric head 150m from an upstream river.
2. 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 25 m and the average width is 4 km. The hydraulic conductivity of the aquifer was obtained at 40 m/day and its void ratio is 0.3333. The piezometer heads in two wells 1.325 km apart are 65 meters and 60 meters from a common reference datum. Determine the rate of flow in cubic meters per day. 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
Refer to Figure 7.24. The following data were collected during the field permeability measurement of a confined aquifer using a pumping test. Determine the hydraulic conductivity of the permeable layer. Use Eq. (7.49). Thickness of the aquifer, H = 4.5 m Piezometric level and radial distance of the first observation well: h1 = 2.9 m; r1 = 17.8 m Piezometric level and radial distance of the second observation well: h2 = 1.8 m; r2 = 8.1 m Rate of discharge from pumping, q = 0.5 m3/min
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).
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 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 80 m aqulfer 1400 m Determine the nearest value of the tirne of travel from the head of aquifer to a point 5.2 km downstream in days (in a whole day).
A permeability pumping test was carried out in unconfined aquifer with the piezometric level before pumping is 2.18m below the ground surface. The first permeable layer has a thickness of 5.7m measured from the ground surface and the unconfined aquifer is 7.0m deep until reaches the aquiclude at the bottom. At a steady pumping rate of 15.6m^3/hr the drawdown in the observation wells were respectively equal to 1.62m and 0.47m. The distance of the observation wells from the center of the test well were 15m and 32m respectively. If the hydraulic gradient is 0.0092 determine the seepage velocity at 0.25 void ratio?
A permeability pumping test was carried out in unconfined aquifer with the piezometric level before pumping is 2.18m below the ground surface. The first permeable layer has a thickness of 5.7m measured from the ground surface and the unconfined aquifer is 7.0m deep until reaches the aquiclude at the bottom. At a steady pumping rate of 15.6m^3/hr the drawdown in the observation wells were respectively equal to 1.62m and 0.47m. The distance of the observation wells from the center of the test well were 15m and 32m respectively. Compute the Transmissibility?
From the figure shown, the thickness of permeable layer is 1.1m making an angle of 14 degrees with the horizontal. K= 4.87x10^-12 cm/sec. If the vertical thickness depth of the aquifer at point of the first piezometer (left) is 1.5m and the other point at second piezometer is 1.1m, determine the flow rate. h=1.4 m Direction impervious layer of seepage 3 m 14 1.1 m impervious layer L. 14
A permeability pumping test was carried out in unconfined aquifer with the piezometric level before pumping is 2.18m below the ground surface. The first permeable layer has a thickness of 5.7m measured from the ground surface and the unconfined aquifer is 7.0m deep until reaches the aquiclude at the bottom. At a steady pumping rate of 15.6m^3/hr the drawdown in the observation wells were respectively equal to 1.62m and 0.47m. The distance of the observation wells from the center of the test well were 15m and 32m respectively. Compute the hydraulic conductivity?
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.
a) A confined stratified aquifer has a total thickness of 16 m and is made up of four layers. The bottom layer has a coefficient of permeability of 30 m/day and a thickness of 5.0 m. Above it is a layer 4 m thickness with a coefficient of permeability of 35 m/day. The third & fourth layers have a permeability of 20 m/day and 45 m/day respectively and are of equal thickness. Calculate the equivalent permeability and transmissivity if the flow is along the stratification.