A 300 mm diameter test well penetrates 24 m below the static water table. After 24 hours of pumping at 69 liters/sec, the water level in an observation well at a distance of 96 m from the test well is lowered 0.60 m and the other observation well at a distance of 34 m from the test well, the drawdown is 1.2 m. Compute the coefficient of permeability of the unconfined aquifer in m/day. Compute the transmissivity of the unconfined aquifer in m2/day. Compute the transmissivity if there is a confined aquifer of 8m, thick below the unconfined aquifer m2/day.

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Question

14. A 300 mm diameter test well penetrates 24 m below the static water table. After 24 hours of pumping at 69 liters/sec, the water level in an observation well at a distance of 96 m from the test well is lowered 0.60 m and the other observation well at a distance of 34 m from the test well, the drawdown is 1.2 m.

  1. Compute the coefficient of permeability of the unconfined aquifer in m/day.
  2. Compute the transmissivity of the unconfined aquifer in m2/day.
  3. Compute the transmissivity if there is a confined aquifer of 8m, thick below the unconfined aquifer m2/day.
a) Compute the coefficient of permeability
evel in an observation well at a distance of
pumping at 69 liters per second, the water
96 m. from the test well is lowered by 0.60 m
and the other observation well at a distance of
34 m. from the test well, the drawdown is
1.2 m.
0.30m
ground surface
=34
Waser table
Uncorfinid
.24m.
Aquifer
Observation
wells
Impermeable layer
a) Compute the coefficient of permeabilily
of
th
m/day.
Transcribed Image Text:a) Compute the coefficient of permeability evel in an observation well at a distance of pumping at 69 liters per second, the water 96 m. from the test well is lowered by 0.60 m and the other observation well at a distance of 34 m. from the test well, the drawdown is 1.2 m. 0.30m ground surface =34 Waser table Uncorfinid .24m. Aquifer Observation wells Impermeable layer a) Compute the coefficient of permeabilily of th m/day.
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