Answered: Determine the aquifer characteristics S…

Engineering

Civil Engineering

Determine the aquifer characteristics S and T assuming that Eq. (4.28) is valid.

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 7.4P

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Concept explainers

Principles of Seepage

In hydrology, when water flows down in a pore or crack of unsaturated soil due to gravity, the deep layer of soil is called seepage. It is the slow movement of water in the soil layer. Seepage is mainly found near hydraulic structures and is responsible for the stability of earthen-type hydraulic structures.

Question

100%

A well pumps water at a rate of 2500 m³/day from a confined aquifer.
Drawdown measurements in an observation well 120 m from the pumping well are as follows:
Drawdown in metres
Time since pump
started in minutes
1
1.5
2
2.5
3
4
0
.10
.20
.30
.40
.50
.60
.70
Example
.80
Ф
5
6
8
1
-
10
12
Determine the aquifer characteristics S and T assuming that Eq. (4.28) is valid.
Drawdown s in
metres
0.05
0.08
0.12
0.14
0.16
0.20
0.23
0.27
0.30
0.34
0.37
O
As = 0.39 M
Time since pump
started in minutes
10
14
18
24
30
50
60
80
100
120
150
Q
O
Time in minutes
O
Drawdown s in
metres
Fig. 4.9 Time-drawdown graph (Example 4.5)
0.40
0.44
0.48
0.52
0.61
0.64
0.68
0.73
0.76
0.80
100
200

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