5. A confined aquifer is 50 m thick and 0.5 km wide. Two observation wells are located 1.4 km apart in the direction of flow. Head in well 1 is 50.0 m and in well 2 is 42 m. Hydraulic conductivity K is 0.7 m/day. a. What is the total daily flow of water through the aquifer? b. What is the height z of the piezometric surface 0.5 km from well 1 and 0.9 km from well 2? 1000 105

5. A confined aquifer is 50 m thick and 0.5 km wide. Two observation wells are located 1.4 km apart in the direction of flow. Head in well 1 is 50.0 m and in well 2 is 42 m. Hydraulic conductivity K is 0.7 m/day. a. What is the total daily flow of water through the aquifer? b. What is the height z of the piezometric surface 0.5 km from well 1 and 0.9 km from well 2? 1000 105

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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P3. 3. Please give the solution and the correct answer.
A confined aquifer of 15 m constant thickness is sandwiched between two aquicludes as shown in the figure. Piezometer P Piezometer Q Piezometric Surface Aquiclude 34.1 m Aquiclude. L= 2500 m Reference Datum The heads indicated by two piezometers P and Q are 55.2 m and 34.1 m, respectively. The aquifer has a hydraulic conductivity of 80 m/day and its effective porosity is 0.25. If the distance between the piezometers is 2500 m, the time taken by the water to travel through the aquifer from piezometer location P to Q (in days, round off to 1 decimal place) IS_ 55.2 m Aquifer
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1. A confined aquifer is recharged by a continuous supply of water from the certain source. The average thickness of the aquifer was determined to be 18 m and the average width is 8 km. The hydraulic conductivity of the aquifer was obtained at 60 m/day and its void ratio is 0.1586. The piezometer heads in two wells 2,145m apart are 128 meters and 188 meters from a common reference datum. Determine: •compute the rate of flow through the aquifer in m3/day •compute the seepage velocity in m/day •compute the time of travel from the head of the aquifer to a point 8 km downstream in days
Q4 (a) A confined stratified aquifer has a total thickness of 22 m and is made up of three layers. The bottom layer has a coefficient of permeability of 12 m/day and a thickness of 6.0 m. The middle and top layers have permeability of 14 m/day and 20 m/day respectively and are of equal thickness. Calculate the following: (i) Equivalent hydraulic conductivity (kp(eq), if the flow is perpendicular to the stratification. (ii) Equivalent hydraulic conductivity (kn(eg)), if the flow is parallel to the stratification. (ii) Ratio of equivalent hydraulic conductivities.
A confined aquifer has a thickness of 30 m and is fully penetrated by well where the aquifer is pumped at the rate of 500 litres per second. The ground thickness (h1) is 50M .The drawdown measured in two observation wells located at distance of 10 m and 100 m from the well are 7.5 m and 0.5 m respectively. Determine the average hydraulic conductivity of the aquifer. At what distance from the well the drawdown is insignificant i.e. is zero.
A confined aquifer has thickness of 33km and 7km wide. Two observation wells are located 1.2km apart in the direction flow. The head in well one is 97.5m and well two is 89m. i) What is the total daily flow through the aquifer? (Hydraulic conductivity of the aquifer is 1.2m/day) ii) What is the elevation of the potentiometric surface at a point located 0.3 from well one and 0.9 from well two?
From the figure shown, an unconfined non homogenous aquifer between two water bodies at a depth of t1 = 96 m and t2 = 75 m respectively. Take K1 = 36 m/s, K2 = 48 m/s, H1 = 1470 m and H2 = 1230 m. K, K2 t2 H1 H2 a. Compute the average coefficient of permeability of the aquifer in m/s. (2 DECIMAL PLACES) b. Compute the rate of flow in m^3/s. (2 DECIMAL PLACES) c. Compute the time in seconds required for the water to pass through the soil if it has a void ratio of 0.36. (2 DECIMAL PLACES)
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.
Answer the following environmental engineering practice questions.
4
An confined aquifer has a thickness of 30m. a fully penetrating 20cm diameter well in this aquifer is pumped at a rate of 35 lit/s. the drawdown measured in two observation well located at distance of 10m and 100m from the well are 7.5m and 0.5m respectively. Determine the average hydraulic conductivity of the aquifer. At what distance from the well the drawdown is insignificant?