Q1: A 30cm diameter well penetrates vertically through an aquifer to an impermeable stratum located 18.0 m below the static water table. After a long period of pumping at a rate of 1.2 m3/min, the drawdown in test holes 11m and 35 m from the pumped well is found to be 3.05 and 1.62m respective. What is the hydraulic conductivity of the aquifer? Express in meters per day. What is its transmissivity? Express in cubic meters per day per meter. What is the drawdown in the pumped well?

Q1: A 30cm diameter well penetrates vertically through an aquifer to an impermeable stratum located 18.0 m below the static water table. After a long period of pumping at a rate of 1.2 m3/min, the drawdown in test holes 11m and 35 m from the pumped well is found to be 3.05 and 1.62m respective. What is the hydraulic conductivity of the aquifer? Express in meters per day. What is its transmissivity? Express in cubic meters per day per meter. What is the drawdown in the pumped well?

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter6: Hydraulic Conductivity

Section: Chapter Questions

Problem 6.15P

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Q1: A 30cm diameter well penetrates vertically through an aquifer to an impermeable stratum located 18.0 m below the static water table. After a long period of pumping at a rate of 1.2 m3/min, the drawdown in test holes 11m and 35 m from the pumped well is found to be 3.05 and 1.62m respective. What is the hydraulic conductivity of the aquifer? Express in meters per day. What is its transmissivity? Express in cubic meters per day per meter. What is the drawdown in the pumped well?
QUESTION 12 1. A 40 cm well completely penetrates an unconfined aquifer of saturated depth 40 m. After a long period of pumping at a steady rate of 0.025 m³/s, the drawdown in two observation wells 20 m and 80 m from the pumping well were found to be 4.0 m and 2.0 m respectively. Determine the hydraulic conductivity of the aquifer. Round off to two (2) decimal places, Fill in the blank_ x 105 m/s
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.?
Determine the following: a) hydraulic conductivity is ______ x10^3 cm/sec b) Transmissbility of the impermeable layer is _____ cm^2/sec c) The drawdown in the test well is ____ m
Plz answer ASAP
Q1) An unconfined aquifer has a thickness of 33 m. A fully penetration 20 cm diameter well in the aquifer is pumped at a rate of 33 lit/s. The drawdown measured in two observation wells located at a distance of 10 m and 100 m from the well are 7.5 m and 0.5 m respectively. Determine: 1- Sketch the case. 2- the average hydraulic conductivity of the aquifer. 3- At what distance from the well the drawdown is insignificant?
18. A well that pumps at a constant rate of 0.5m/s fully penetrates a confined aquifer of 34 m thickness. After a long period of pumping, near steady-state conditions, the measured drawdowns at two observations wells 50 and 100 m from the pumping well are 0.9 and 0.4m respectively. a) Calculate the hydraulic conductivity and transmissivity of the aquifer. b) Estimate the radius of influence of the pumping well c) Calculate the expected drawdown in the pumping well if the radius of well is 0.4m
A 2‐ft diameter well penetrates vertically through a confined aquifer 50 ft thick. When the well is pumped at 500 gpm, the drawdown in a well 50 ft away is 10 ft and in another well 100 ft away is 3 ft.(a) What is the approximate head in the pumped well for steady‐state conditions, and what is the approximate drawdown in the well?(b) Compute the transmissivity. Take the initial piezometric level as 100 ft above the datum.
2. (a) A well in an aquifer is pumped over a long period at a rate of 0.05 m3 /s under approximate steady-state conditions. The steady-state drawdowns, from the water table level, at two observation wells at 25 m and 50 m from the abstraction well were observed to be 15.3m and 9.5m, respectively. If the saturated thickness of the aquifer prior to pumping is 80 m, determine the hydraulic conductivity of the aquifer material. (b) Will the actual drawdown in the pumping well be more than the theoretical drawdown? If yes, why and what measures can you recommend for reducing the drawdown in the pumping well?
1 st question
(b) | A 400 mm diameter well fully penetrates a confined aquifer of thickness 20 m is pumped at a constant rate of 2500 m/day. The drawdown in the pumping well is observed as 4 m and the radius of influence is at a distance of 100 m. (i) Calculate the transmissivity of the aquifer; (ii) Determine the hydraulic conductivity of the aquifer material and draw the neat sketch of the well
a 45 cm well in an unconditioned aquifer of saturated thickness (40+8) m yields (600+10(2) lpm under a drawdown of 4m at the pumping well. Assuming radius of influence of (500+10(3)m, a. what is the hydraulic conductivity of the aquifer in m/day? b. what will be the drawdown 200 m from the well? c. what will be the piezometric head 400 m from the well