Question- Three tube wells of 25 cm, diameter each are located at the three vertices of an equilateral triangle of side 100 m. Each tube well penetrates fully in a confined aquifer of thickness 25 m. Assume the radius of influence for these wells and the coefficient of permeability of the aquifer as 300 m and 40 m/day respectively. Calculate the discharge when only one well is pumping with a drawdown of 3 m. (i) (ii) (iii) What will be the percent change in discharge of this well if all the three wells were to pump such that the drawdown is 3 m in all the wells?

Question- Three tube wells of 25 cm, diameter each are located at the three vertices of an equilateral triangle of side 100 m. Each tube well penetrates fully in a confined aquifer of thickness 25 m. Assume the radius of influence for these wells and the coefficient of permeability of the aquifer as 300 m and 40 m/day respectively. Calculate the discharge when only one well is pumping with a drawdown of 3 m. (i) (ii) (iii) What will be the percent change in discharge of this well if all the three wells were to pump such that the drawdown is 3 m in all the wells?

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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31 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 5,721.4 m^3/day. The first one, 81.07 meters from the test well, has a draw-down of 0.6 meters. The second one, 40 meters from the test well, has a draw-down of 1.43 meters.The static water table penetrates the well to a depth of 25 meters. Determine the radius of influence of the aquifer in meters. Round off to three decimal places.
Problem 3.5 A well of diameter 0.3 m is constructed to the full depth of an unconfined aquifer of thickness of 150 m. The water table is 10 m below the ground surface. A pumping test of 12 m'/hour has resulted a drawdown of 10 m. Assuming ro = 400 m; calculate the coefficient of permeability of the aquifer. If the flow rate increases to 18 m'/hour, and in the absence of any other data, what will be the best estimate for the drawdown in the well?
With an observation well situated is 69.7 ft away from the pumping well (which is pumping at the rate of 305 gal/min). The aquifer is confined, and the depth has been measured from well logs and is 150 ft. please show using this data how to calculate transmissivity (T), the hydraulic conductivity (K) and Storativity (S) for the aquifer. Thank You s (m) t (sec) 20.7 4074.3 30.76 6054.6 46.3 9054.6 67.33 13254.6 107.26 21114 152.67 30054 209.37 41274 305.38 60114 451.68 88914 671.44 132174 946.07 186234 1321.9 260214
QUESTION 11 1. The discharge from a fully penetrating well operating under steady state in a confined aquifer of 30 m thickness is 1500 liters/minutes. The drawdown observed at an observation well located at 20 m is 3 m. The transmissibility is 0.005 m²/s. Determine the location of the observation well with 0.5 m drawdown. Round off to two (2) decimal places, in m
A pump test was carried out in an unconfined aquifer of k = 3x10^-6 m/s with a flow rate of 25m3/hour. The radius of the well is 0.5m and the aquifer has a depth of 80m above an impermeable stratum. The drawdown in an observation well at a distance of 150m from the well is 2.5m. Calculate the depth of water in the well and the radius of influence??
QI. s) Q1: A 1 m diameter well penetrates vertically through a confined aquifer (30 m) thick. When the well is pumped at (2712 m³/day), the drawdown in a well 15 m away from pumped well is 1.8 m; while the drawdown in another well 50 m away from pumped well is 0.5 m. Take the maximum head is 40 m. 1- Determine the transmissivity. 2- What is the approximate head in the first well? 3- What is the approximate head in the second well? 4- What is the approximate head in the pumped well for steady-state conditions? 5- What is the approximate drawdown in the pumped well?
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ENVIRONMENTAL ENGINEERING ( Practice Questions) a). Suppose a well 0.36m in diameter has been pumped at a rate of 3,000cu.m/day for a long enough time that steady-state conditions apply. An observation well located 30m from the pumped well has been drawn down by 1.0m, and another well at 120m is drawn down by 0.4m. The pumped well extends completely through an unconfined aquifer 60.0m thick. GIVEN: For an unconconfined aquifer, Q = πK(h2c1 – h2c2) / [Ln(r1 / r2)] Determine the hydraulic conductivity, K. (7 marks) (ii) Estimate the drawdown at the pumped well. State any assumptions made. b). A confined aquifer 40.0 m thick has two monitoring wells spaced 400m apart along the direction of groundwater flow. The difference in water level in the wells is 4.0m (the difference in piezometric head). The hydraulic conductivity is 40m/day. Estimate the rate of flow per meter of distance perpendicular to the flow. C). Suppose the aquifer, which has a…