A confined aquifer has hydraulic conductivity of the aquifer, K =50 m/day and 0.2 of porosity. The piezometric head in two wells are 55 m and 50 m, respectively, which 1000 m apart to each other. The average thickness and width of the aquifer are 25 m and 5 km, respectively. Estimate The flowrate through the aquifer. Based on the result, describe the type of layer as shown in TABLE Q5(a) in terms of storability effect. (i) (ii) Time of travel from the head of the aquifer to downstream of 3.5 km by assuming no dispersion or diffusion along the aquifer. Discuss on what would happen if there are dispersion or diffusion occur along the aquifer due to pumping activity

A confined aquifer has hydraulic conductivity of the aquifer, K =50 m/day and 0.2 of porosity. The piezometric head in two wells are 55 m and 50 m, respectively, which 1000 m apart to each other. The average thickness and width of the aquifer are 25 m and 5 km, respectively. Estimate The flowrate through the aquifer. Based on the result, describe the type of layer as shown in TABLE Q5(a) in terms of storability effect. (i) (ii) Time of travel from the head of the aquifer to downstream of 3.5 km by assuming no dispersion or diffusion along the aquifer. Discuss on what would happen if there are dispersion or diffusion occur along the aquifer due to pumping activity

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

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TABLE Q5(a)
Hydraulic
Conductivity
Range (cm/sec)
<1 x 10°
1 x 10° - 6 x 10°
6 x 10
Condition of Rock Mass
Classification
Discontinuities
Very Low
Low
2 x 10
2 x 10* - 6 x 10*
6 x 10* - 1 x 10°
> 1 x 103
Very tight
Tight
Few partly open
Some open
Many open
Open closely spaced or voids
Moderate
Medium
High
Very High

A confined aquifer has hydraulic conductivity of the aquifer, K =50 m/day and 0.2 of
porosity. The piezometric head in two wells are 55 m and 50 m, respectively, which
1000 m apart to each other. The average thickness and width of the aquifer are 25 m
and 5 km, respectively. Estimate
(i)
The flowrate through the aquifer. Based on the result, describe the type of layer
as shown in TABLE Q5(a) in terms of storability effect.
(ii)
Time of travel from the head of the aquifer to downstream of 3.5 km by
assuming no dispersion or diffusion along the aquifer. Discuss on what would
happen if there are dispersion or diffusion occur along the aquifer due to
pumping activity

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