Consider two strata of the same soil material that lie between two channels. The first stratumis confined and the second one is unconfined, and the water surface elevations in the channelsare 24 and 16 m above the bottom of the unconfined aquifer. What should be the thickness ofthe confined aquifer for which2) the discharge through the confined aquifer is half of that through the unconfined aquifer?

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Answered: Consider two strata of the same soil…

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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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.
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1. In an unconfined aquifer, is the piezometric surface above or below the upper boundary of the aquifer? Explain. 2. What is the general shape of the piezometric surface surrounding a single pumping well?
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.
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.
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.
Calculate the water discharge through two aquifers that have similar dimensions (30 m thick, 1.5 km wide, 1m/km potentiometric surface). Aquifer 1 is gravelly with a permeability of 0.042 m/s while Aquifer 2 is mostly silty sandstone with a permeability of 4.2x104 m/s. Permeability (m/sec) Aquifer 1 Ah/Al Cross sectional Area (m²) Water Discharge Aquifer 2
Qs. The difference between the free water levels in two wells 48 m part in an aquifer is 0.6m. It took an interval of 8 hours between detecting the traces of a tracer material at the two wells in succession. The porosity of the aquifer is 25%. The coefficient of permeability of the aquifer is_______ cm/sec.please dont solve wrong
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.
Name the two types of groundwater aquifers. Describe how they differ. What type of aquifer generally occurs closest to the land surface (i.e. is shallowest in the subsurface)? In an unconfined aquifer, what physical boundary does the piezometric surface correspond to?
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
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

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