Two wells are drilled 710 m apart in a confined aquifer with a thickness of 42 m. The heads in the upgradient and downgradient wells are measured at 68.4 and 57.2 m, respectively. The valley in which the aquifer is located is 1.4 km wide. The aquifer's hydraulic conductivity is 24 m/d, and its effective porosity is 0.22. Find the volumetric flow rate Q, specific discharge q, and velocity v of the water flowing through the aquifer.

Two wells are drilled 710 m apart in a confined aquifer with a thickness of 42 m. The heads in the upgradient and downgradient wells are measured at 68.4 and 57.2 m, respectively. The valley in which the aquifer is located is 1.4 km wide. The aquifer's hydraulic conductivity is 24 m/d, and its effective porosity is 0.22. Find the volumetric flow rate Q, specific discharge q, and velocity v of the water flowing through the aquifer.

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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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.

Question

Two wells are drilled 710 m apart in a confined aquifer with a thickness of 42 m. The heads in the upgradient and downgradient wells are measured at 68.4 and 57.2 m, respectively. The valley in which the aquifer is located is 1.4 km wide. The aquifer’s hydraulic conductivity is 24 m/d, and its effective porosity is 0.22. Find the volumetric flow rate Q, specific discharge q, and velocity v of the water flowing through the aquifer.

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Answer question 5
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Problem 1. 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 4.4m and a hydraulic conductivity of 4.5m/day. The bottom layer has a thickness of 6.2m and a hydraulic conductivity of 2.2m/day. Compute the equivalent horizontal and vertical hydraulic conductivities.
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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