Which of the following are characteristics of an unconfined aquifer. Select all that apply. Pore spaces are 100% filled with water. An artesian well results from digging into this aquifer. This aquifer is sandwiched between two impermeable layers. This aquifer can reach the ground surface if the water table depth is already shallow

Which of the following are characteristics of an unconfined aquifer. Select all that apply. Pore spaces are 100% filled with water. An artesian well results from digging into this aquifer. This aquifer is sandwiched between two impermeable layers. This aquifer can reach the ground surface if the water table depth is already shallow

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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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.

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Which of the following are characteristics of an unconfined aquifer. Select all
that apply.
Pore spaces are 100% filled with water.
An artesian well results from digging into this aquifer.
This aquifer is sandwiched between two impermeable layers.
This aquifer can reach the ground surface if the water table depth is already shallow.

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True or false
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.
In confined or unconfined aquifers water levels in wells are above the top of the aquifer?
A silty-sand aquifer has a hydraulic conductivity of 10-4 cm/s. Two piezometers are located 300 m apart and indicate groundwater elevations of 12m and 10m above a datum. The porosity of the aquifer is 0.30. (a) What is the specific discharge in this aquifer? (b) What is the maximum velocity that a salt tracer would move in this aquifer? (c) Assuming that the aquifer is 8 m in depth, what is the discharge per meter perpendicular to the water flow?
Problem 8 A permeability pumping test was carried out through a confined aquifer. The aquiclude (impermeable layer) above confined aquifer has a thickness of 6.8 m from the ground surface. The water table before pumping was 2.3 m below the ground surface. The well penetrates through a confined aquifer which is 5.8 m thick. Below the confined aquifer is a solid bedrock (aquiclude). At a steady pumping rate of 26.8 m³/hr, drawdowns on two observation wells located 15 m and 30 m from the main well are 1.4 m and 0.42 m, respectively. Determine the pumping rate in GPD. 169915 174563 154256 a. A. C. 166325 b. Determine the coefficient of permeability in m/day. A. 5.89 ن ن نے C. 4.25 C. B. D. A. C. 901.4 B. D. the Determine coefficient of transmissibility in liters per hr per vertical meter of the saturated aquifer. 1056.2 B. D. 3.24 3.73 ENGR. CHRYSLER G. DUASO, CE. RMP 854.7 963.4
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?
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 confined aquifer is 6 m thick and the coefficient of permeability in the soil is 2m/day-m2. Two wells tapped on the aquifer are 100 m apart, and the difference in the water elevation in the wells is 3.0 m. The effective porosity is 0.38. What are the average (Darcy) velocity through the aquifer and the flow rate per meter width of aquifer? Darcy velocity is 0.06 m/day and the flow rate is 0.36 cubic meter per day per meter width. Darcy velocity is 0.16 m/day and the flow rate is 0.06 cubic meter per day per meter width. Darcy velocity is 0.16 m/day and the flow rate is 0.36 cubic meter per day per meter width. Darcy velocity is 0.06 m/day and the flow rate is 0.16 cubic meter per day per meter width. The best answer is not among the choices.
Determine the following: a) depth of water in the test well is ______ m b) Transmissbility of the impermeable layer is _____ sq.m/s c) Permeability of the aquifer is ____ m/s
A 0.3 m well has a 25 m long screen that covers the entire depth of an aquifer. The aquifer medium has an effective grain size of 1.5 mm. The well is pumped at a rate of 0.2 m³/s. Assess the validity of Darcy's law near the well. Assume, porosity = 0.25 (Dynamic viscosity of water at 20°C is 1.005*10-3 Ns/m2)