-) A (50 cm) well fully penetrates an unconfined aquifer of saturated depth 80 m. When a discharge of (50 m³/min) was being pumped for a long time, observed wells at radial distances of 100 and 300 m indicated drawdown of 1 and 0.5 m respectively. Estimate the coefficient of permeability (K) and transmissibility (T) of the aquifer, drawdown at the pumping well and the slop of water table?

-) A (50 cm) well fully penetrates an unconfined aquifer of saturated depth 80 m. When a discharge of (50 m³/min) was being pumped for a long time, observed wells at radial distances of 100 and 300 m indicated drawdown of 1 and 0.5 m respectively. Estimate the coefficient of permeability (K) and transmissibility (T) of the aquifer, drawdown at the pumping well and the slop of water table?

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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B- A 20cm diameter well penetrates fully a confined aquifer of thickness 25m .when the well is pumped at a rate of 200 liters/ minute the drawdown in two observaƟons wells located at 10m and 100m distance from center of well are found to be 3.5m and 0.05 m respectively .calculate the hydraulic conductivity of the aquifer and the radius of influence and the drawdown in the well.?
A tube well of 30 cm dia. is installed in a confined aquifer having 20 m thickness in the Gulberg area. Two observatory wells are installed at a distance of 120m and 160m from the center of main tube well. Under the constant Pumpage rate of 1500 L/min, the observed water depth in the observatory wells is 58m and 59m respectively. The radius of cone of depression was 300m and depth of water (H) at zero drawdown is 65 m. With the above data calculate: 1) Co-efficient of transmissivity (T) and Co-efficient of Permeability (K).
A tube well of 30 cm dia. is installed in a confined aquifer having 20 m thickness . Two observatory wells are installed at a distance of 120m and 160m from the center of main tube well. Under the constant Pumpage rate of 1500 L/min, the observed water depth in the observatory wells is 58m and 59m respectively. The radius of cone of depression was 300m and depth of water (H) at zero drawdown is 65 m. With the above data calculate: 1) Co-efficient of transmissivity (T) and Co-efficient of Permeability (K).
The static level of water table in an unconfined aquifer was 30 m above the underlying impermeablestratum. A 150 mm diameter well, penetrating the aquifer to its full depth, was pumped at the rate of20 liters per second. After several weeks of pumping, the drawdown in observation wells 20 m and 50m from the well were 3.5 m and 2 m respectively, and the observed drawdowns were increasing veryslowly (B.Sc., DU, 2012).a) Assuming equilibrium conditions, estimate the hydraulic conductivity and transmissivity of theaquifer.b) Estimate the drawdown just outside the pumped well.c) What will be the yield of a 300 mm diameter well which will produce the same drawdowns justoutside the well and at the 50 m distance observation well in (2)? What would be the drawdown at anearer observation well?
A well is pumping at an unknown, steady rate in a confined aquifer. Near the pumping well are two observation wells; observation well A is located 8m from the pumping well and B is located 24m from the pump- ing well. The heads in these wells are hA = 134.20 and hB = 134.28 m. You know from prior pumping tests of the well that the well and the observation wells are screened in a confined aquifer with transmissivity T = 1200 m2/day. Assuming that without the well pumping there would be no hydraulic gradient at all, what is the pumping rate of the well?
A 45-cm well penetrates an unconfined aquifer of saturated thickness 30 m completely. Under a steady pumping rate for a long time the drawdowns at two observation wells 15 and 30 m from the well are 5.0 and 4.2 m respectively. If the permeability of the aquifer is 20 m/day, determine the discharge and the drawdown at the pumping well. Ans. 2556 lpm; 10.54 m
A 30 cm well penetrates an unconfined aquifer of saturated depth of 25m. When a discharge of 2100 lpm was being pumped for a long time, observation wells at radial distances of 30m and 90m indicated drawdown of 5m and 4m, respectively. Estimate the coefficient of permeability and the drawdown at pumping well.
A 300 mm diameter test well penetrates 27 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 95 m from the test well is lowered 0.5 m and the other observation well at a distance of 35 m from the test well, the drawdown is 1.1 m. Compute the transmissibility of the aquifer in m^2/day.
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The static level of water table in an unconfined aquifer was 35m above the underlying impermeable stratum. A 75mm radius well, penetrating the aquifer to its full depth, was pumped at the rate of 28 liters per second. After several weeks of pumping, the drawdown in observation wells 20m and 50m from the well were 3m and 2.5m respectively, and the observed drawdowns were increasing very slowly. (B.Sc., UAE, 1989).a) Assuming equilibrium conditions, estimate the hydraulic conductivity and transmissivity of the aquifer.b) Estimate the drawdown just outside the pumped well.
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