Assignment no. 3 Problem # 1. 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 96m from the test well is lowered 0.60m. And the other observation well at a distance of 34m from the test well, the drawdown is 1.2m. a. Compute the coefficient of permeability of the unconfined aquifer in m/day. b. Compute the transmissibility of the unconfined aquifer in m2/day. C. Compute the transmissibility of a confined aquifer 8m. thick below the unconfined aquifer in m2/day.

Assignment no. 3 Problem # 1. 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 96m from the test well is lowered 0.60m. And the other observation well at a distance of 34m from the test well, the drawdown is 1.2m. a. Compute the coefficient of permeability of the unconfined aquifer in m/day. b. Compute the transmissibility of the unconfined aquifer in m2/day. C. Compute the transmissibility of a confined aquifer 8m. thick below the unconfined aquifer in m2/day.

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

Field applications of hydraulic conductivity

Hydraulic conductivity is one of the hydraulic properties of soil defined as a measurement of the ability of a porous medium to permit water movement or fluid flow through it. It is denoted by the letter K. It is influenced by the density and viscosity of the fluid. It is also called permeability. Hydraulic conductivity is defined as the ratio of velocity to the hydraulic gradient. The different methods used to determine the hydraulic conductivity are laboratory methods (constant head permeability tests and falling head tests), in-situ field methods (pumping in and pumping out tests), small scale field tests (infiltration tests and slug tests), and indirect methods such as estimation from grain size, consolidation test data, and horizontal capillary test. The pedotransfer function (PTF) method is a specific empirical estimating approach employed in the soil sciences is also used to determine the hydraulic conductivity of the soil.

Question

Assignment no. 3
Problem # 1. 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 96m from the test well is
lowered 0.60m. And the other observation well at a distance of 34m from the test well, the drawdown is
1.2m.
a. Compute the coefficient of permeability of the unconfined aquifer in m/day.
b. Compute the transmissibility of the unconfined aquifer in m2/day.
Compute the transmissibility of a confined aquifer 8m. thick below the unconfined aquifer
in m2/day.
I.

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STEP 1: BASIC DATA PROVIDED:

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STEP 2: DETERMINATION OF CO-EFFICIENT OF PERMEABILITY:

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STEP 3: DETERMINATION OF TRANSMISSIBILITY OF UN-CONFINED AQUIFER:

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STEP 4: DETERMINATION OF TRANSMISSIBILITY OF CONFINED AQUIFER :

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(b) TABLE Q1(b) shows three layers of soil used in permeability pilot test. (i) Calculate the average vertical conductivity of the soil in cm/day. (ii) Calculate the transmissivity of the soil when water is at the ground surface. (iii) Discuss the factors that might affect the results obtained in Q1(b)(i) and Q1(b)(ii).
A pumping test was carried out in confined aquifer thickness 2 m and the following measurement was recorded. Rate of pumping was 10 m^3/s; drawdown in pumping well was 2.0 m while on the observation well located at 15 m and 20 m from the centre of the pumping well were 1.6 m and 1.4 m, respectively. Determine the hydraulic conductivity of soil.
A 400 mm diameter test well penetrates 27 m below the static water table. After 24 hours of pumping at 75 liters/sec, the water level in an observation well at a distance of 100 m from the test well is lowered 0.35 m. The other observation well at a distance of 40 m from the test well has a drawdown of 0.97 m. Compute the transmissibility of the aquifer in m?/day.
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Yuri wants to determine the permeability of an aquifer. The aquifer has a test well 300-mm in diameter with two observation wells. A pumping test was conducted for 24 hours with the discharge being held constant at 5,896.3 m^3/day. The first one, 82.87 meters from the test well, has a draw-down of 0.86 meters. The second one, 44 meters from the test well, has a draw-down of 1.21 meters.The static water table penetrates the well to a depth of 28 meters. Determine the radius of influence of the aquifer in meters. Round off to three decimal places.
An unconfined aquifer is 10 m thick and is being pumped so that one observation well placed at a distance 76 m shows a drawdown of 0.5 m. On the opposite side of the extraction well is another observation well 100 m from the extraction well, shows a drawdown of 0.3 m. Assume the coefficient of permeability of 50 m/day. a.) What is the discharge f the extraction well? b.) Suppose the well at 100 m from the extraction well is now pumped. Show with a sketch what this will do to the drawdown. c.) Suppose the aquifer sits on an aquaclude that has a slope of 1/100. Show with a sketch what this will do to the drawdown.
Yuri wants to determine the permeability of an aquifer The aquifer has a test well 300-mm in diameter with two observation wells A pumping test was conducted for 24 hours with the discharge being held constant at 5,608.7 m^3/day. The first one, 86 59 meters from the test well, has a draw-down of 0.81 meters. The second one, 48 meters from the test well, has a draw-down of 1.13 meters. The static water table penetrates the well to a depth of 28 meters. Determine the radius of influence of the aquifer in meters Round off to three decimal places. Activate Windows A Moving to another question will save this response. Go to Settings to actiyate Windows Question 8 of 20 ASUS W R] 7T U K
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Problem (4) The following results have been reported for field pumping test from a well, where the top permeable layer is unconfined and underlain by an impermeable layer, for a steady state condition: m3 q = 0.68 min h, = 5.6m at r, = 60m h, = 5m at r, = 30m Calculate the hydraulic conductivity (cm/s) of the permeable layer.
DETERMINE: a. Rate of seepage into the well during pumping
Charyeong wants to determine the permeability of an aquifer. The aquifer has a 300 mm diameter test well that penetrates 27 m. below the static water table. After 24 hours of pumping at 61 liters/sec, the water level in an observation well 93.53 m. from the test well was lowered to 24.83 m. and the other observation well at 33.3 m. from the test well, was lowered to 23.02 m. Determine the coefficient of permeability of the aquifer in m/day.