Q4) Two observation wells 1700m apart have been constructed in a confined aquifer as shown if fig below. the flow rate is 0.008m'/hr per unit width of the confined aquifer .Well 1 is drilled in soil A with hydraulic conductivity 13m/day, and well2 in soil C with hydraulic conductivity 9m/day. the soil zone B is between the wells, 600 m from well 1 and 300m from well 2. the water level is 6m above upper confining unit in well land 2.5m above upper confining unit in well 2.estamate the hydraulic conductivity of soil B?

Q4) Two observation wells 1700m apart have been constructed in a confined aquifer as shown if fig below. the flow rate is 0.008m'/hr per unit width of the confined aquifer .Well 1 is drilled in soil A with hydraulic conductivity 13m/day, and well2 in soil C with hydraulic conductivity 9m/day. the soil zone B is between the wells, 600 m from well 1 and 300m from well 2. the water level is 6m above upper confining unit in well land 2.5m above upper confining unit in well 2.estamate the hydraulic conductivity of soil B?

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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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 well penetrates an unconfined aquifer, with undisturbed water level (ho) equal to 21m. After pumping the well at a constant rate of Q = 0.07 m/s, the steady-state drawdown at distances of 45 m and 110 m from the well are 3 m and 1 m. respectively. Assume the void ratio as 0.2. Compute the hydraulic conductivity of the aquifer. 215.0 m/day what is the porosity 0.16 find the darcy velocity in m/day 69.4 m/day
4. A confined aquifer of 10-m thickness and 16.43 m/day hydraulic conductivity is fully penetrate by a pumping well of 0.5 m radius operating at Q=425 m³/day. Determine the drawdown under steady-state conditions in a) the pumping well and b) 50 m away from the well. Take the radius of influence of the pumping well as 300 m.
3b) A well of r = 0.328 ft , drainage area 650 acres and Pwr=4500 psia in the reservoir of following characteristics (K = 28 md, h = 59 ft, Pe= 5651 psia, u = 1.67 cp, and B, 1.12 rb/stb). This well is producing at steady state with an outer boundary constant pressure of 5651 psia. This well suffers from skin effect equals to + 10 and penetration of damage is 3ft beyond the wall of the well. Answer Following Questions: A) Calculate production rate of the well for s =+10 and s = zero. B) Describe two mechanisms to increase damaged well production by 30% C) Permeability of damage zone.
Q3. A 200 mm diameter well which fully penetrating a confined aquifer of thickness 25 m is pumped at a constant rate of 2000 m3/day. The steady state drawdown in the well is 8 m and the drawdown in a piezometer 100 m from the well is 1.4 m.(a) Ignoring well losses, calculate the transmissivity of the aquifer, the hydraulic conductivity of the aquifer material and the radius of influence of the well.(b) Repeat the calculation for an unconfined aquifer with saturated thickness 25 m
A capture well is pumping at a rate of 1700 m^3 /day from a confined aquifer with a hydraulic conductivity of 425 m/day, an initial hydraulic gradient of -0.00098 and a saturated thickness of 22 m. Water is flowing from west to east. a. What is the maximum width of the capture zone in m to the nearest ones place? b. What is the distance from the well to the stagnation point in m to the nearest ones place? Consider what sign makes sense. c. True or False: The majority of the capture zone is to the west of the capture well.
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?
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?
8- 3 wells are sunk in a confined aquifer in a straight line at 25 m intervals. If one end well is pumped at rate of 300 m³/day, the steady state drawdown in the other wells was found to be 3 m and 2 m. Find the aquifer transmissivity. If all the wells are pumped at the same rate of 300 m³/day, what is the minimum drawdown between the wells?
TELEGRAM 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?
Q2. A pumping tests are carried out using testing well (pumping well for testing only) and two observational wells. The observation wells were installed at 10 and 30.5 m, respectively, from the testing well. In both wells, the initial piezometric head was 36.2 m. The pumping proceeded at a rate of 0.19 m³/s. After few days the piezometric head stabilized at 30.7 m and 32.9 m in the first and second observational wells, respectively. Determine: a. Transmissivity of the aquifer. b. The well radius of influence. c. The maximum drawdown if the well radius is 0.47 m.
A well was constructed to pump water from a confined aquifer. Two observation wells were constructed distances of 60m and 220m respectively. At a steady pumping rate of 0.15m^3/min, the drawdown in the observation wells were respectively equal to 1.5m and 5.2m. Diameter of the test well is 0.75m and thickness of confined aquifer is 15m. 1. Determine the hydraulic conductivity of the soil in m/min. 2. Determine the drawdown at the test well in m. 3. What is the value of the transmissivity of the confined aquifer in m^2/day?