DETERMINE: a. Rate of seepage into the well during pumping (b) A well of size 6.60 × 4.05 m and depth 4.7 m in the lateritic soil near Mangalore (west coastof India) has its normal water level at 3.825 m below ground level (bgl). By pumping for 1½hours, the water level (bgl) was depressed to 4.525 m and the pumping was stopped. Therecuperation rates of the well during 2 hours after the pumping stopped are given below.The total volume of water pumped during 1½ hours of pumping was 28.87 m³ (no well steiningis provided)Time since pumpingstopped (min)0102030405060708090Recuperation rates120150Water level, bgl(m)4.5254.3654.2454.1354.0754.0153.9853.9603.9503.9353.9203.902

Given Data Size of the well=6.60×4.05 mThe depth of the well=4.7 mNormal water level=3.825 mPumping…

) A well of size 6.60 x 4.05 m and depth 4.7 m in the lateritic soil near Mangalore (west coast of India) has its normal water level at 3.825 m below ground level (bgl). By pumping for 1 hours, the water level (bgl) was depressed to 4.525 m and the pumping was stopped. The recuperation rates of the well during 24 hours after the pumping stopped are given below. The total volume of water pumped during 1½ hours of pumping was 28.87 m³ (no well steining is provided)

) A well of size 6.60 x 4.05 m and depth 4.7 m in the lateritic soil near Mangalore (west coast of India) has its normal water level at 3.825 m below ground level (bgl). By pumping for 1 hours, the water level (bgl) was depressed to 4.525 m and the pumping was stopped. The recuperation rates of the well during 24 hours after the pumping stopped are given below. The total volume of water pumped during 1½ hours of pumping was 28.87 m³ (no well steining is provided)

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

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

DETERMINE: a. Rate of seepage into the well during pumping

(b) A well of size 6.60 × 4.05 m and depth 4.7 m in the lateritic soil near Mangalore (west coast
of India) has its normal water level at 3.825 m below ground level (bgl). By pumping for 1½
hours, the water level (bgl) was depressed to 4.525 m and the pumping was stopped. The
recuperation rates of the well during 2 hours after the pumping stopped are given below.
The total volume of water pumped during 1½ hours of pumping was 28.87 m³ (no well steining
is provided)
Time since pumping
stopped (min)
0
10
20
30
40
50
60
70
80
90
Recuperation rates
120
150
Water level, bgl
(m)
4.525
4.365
4.245
4.135
4.075
4.015
3.985
3.960
3.950
3.935
3.920
3.902

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