(b) A well penetrates an unconfined aquifer. The water level in the wellprior to pumping was 14 m. After long period of pumping at a constantrate of 50 l/s, the drawdown in the two observation wells located at 10m and 15 m were observed to be 3 and 1.4 m, respectively.(i)Calculate the hydraulic conductivity of the aquifer;(ii)(iii)Determine the transmissivity of the aquifer material;Draw a neat sketch to show the labelled diagram of the well. * l.formula sheet.pdf +968 9326 0937 >FORMULAE SHEET10.67 × L x Q1.85hfhf= KQ?C1.85 x d4.87Q = 0.00278 × C × i × A30 x 25.4i =40 × 25.4i =orQ == 0.00278 × Ap ×iT + 10Т+ 202nKb(h2 – h1)2nT(s1 – $2)Q :In (2)In (2T×K × (h; – h})In3/8QFs= 23.97 × D°%3 × VĪDestQтах[23.97×11/21Keq.H(K,H, + K2H2 + K3H3)HHKy(eq)НH2 H3K1K2 " K3

Hydraulic conductivity: The measure of the ability of material for the transmission of fluid through…

(b) A well penetrates an unconfined aquifer. The water level in the well prior to pumping was 14 m. After long period of pumping at a constant rate of 50 l/s, the drawdown in the two observation wells located at 10 m and 15 m were observed to be 3 and 1.4 m, respectively. (i) Calculate the hydraulic conductivity of the aquifer; (ii) Determine the transmissivity of the aquifer material; (ii) Draw a neat sketch to show the labelled diagram of the well.

(b) A well penetrates an unconfined aquifer. The water level in the well prior to pumping was 14 m. After long period of pumping at a constant rate of 50 l/s, the drawdown in the two observation wells located at 10 m and 15 m were observed to be 3 and 1.4 m, respectively. (i) Calculate the hydraulic conductivity of the aquifer; (ii) Determine the transmissivity of the aquifer material; (ii) Draw a neat sketch to show the labelled diagram of the well.

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 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
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.
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?
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.?
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?
A pump out test is carried out in a perforated well of 30 cm in diameter, extending into an impervious zone, and through an aquifer 17 m thick from the ground surface. The phreatic line is at 4 m below ground-surface level. After 24 hours of continuously pumping water out of the well, equilibrium has been reached. The discharge of the pump is 5.4 cu.m/hr and the drawdown is 4 m. The radius of influence R was estimated to be 15 m. Determine the average coefficient of permeability of the soil.
14. 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 5618.7 m^3/day. The first one, 88.43 meters from the test well, has a draw-down of 0.52 meters. The second one, 48 meters from the test well, has a draw-down of 1.48 meters.The static water table penetrates the well to a depth of 27 meters. Determine the radius of influence of the aquifer in meters. Round off to three decimal places.
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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 5,598.8 m^3/day. The first one, 88.03 meters from the test well, has a draw-down of 0.95 meters. The second one, 42 meters from the test well, has a draw-down of 1.39 meters.The static water table penetrates the well to a depth of 27 meters. Determine the radius of influence of the aquifer in meters.
The wells shown below are in a leaky confined aquifer. The aquifer has a hydraulic conductivity of 30 ft/d, saturated thickness of 45.0 ft, and storage coefficient of 0.00080. The aquitard above has a thickness of 8.0 ft and vertical conductivity of 0.45 ft/d. Well A was turned on at noon Sunday with a flow rate of 150 gpm. Well B was turned on at noon Tuesday with a flow rate of 200 gpm. Find the total drawdown in ft at the observation well C at noon Thursday. 150 ft 350 ft 150 ft
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