A confined aquifer has a source of recharge as shown in the figure. conductivity of the aquifer is 40 m/day and its porosity is 0.25. The piezometric head in the two wells 1000 m. apart is 65 m. and 60 m. respectively from a common data. The average thickness of the aquifer is 25 m. and the average width is 4 km. The hydraulic O Compute the rate of flow through the aquifer in mlday. Compute the seepage velocity. ® Compute the time of travel from the head of the aquifer to a point 3 km. downstream in days. Recharge 2) EL 602 125 m Solution: Rate of flow:

A confined aquifer has a source of recharge as shown in the figure. conductivity of the aquifer is 40 m/day and its porosity is 0.25. The piezometric head in the two wells 1000 m. apart is 65 m. and 60 m. respectively from a common data. The average thickness of the aquifer is 25 m. and the average width is 4 km. The hydraulic O Compute the rate of flow through the aquifer in mlday. Compute the seepage velocity. ® Compute the time of travel from the head of the aquifer to a point 3 km. downstream in days. Recharge 2) EL 602 125 m Solution: Rate of flow:

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 4-cell aquifer model is conceptualized in the figure below. River Cell 1 Cell 2 Cell 3 (a) Top view (b) Cross section Cell 4 Impervious boundary The width of the aquifer strip is 3.0 km; the length of each cell is 5 km. The recharge rates for the aquifer strip is 400 mm/yr, 300 mm/yr, 300 mm/yr, 200 mm/yr in Cells 1,2,3, and 4,respectively. The water level in the river is maintained at a constant elevation of 160 m above the horizontal impervious bottom. The hydraulic conductivity in Cells 1 and 2 is 3 m/d, while in Cells 3 and 4 it is 6 m/d. Using this conceptual model, determine: 1. Write the steady-flow balance equations to estimate average water levels in the four cells. 2. Solve these equations to determine the average elevations in the 4 cells without pumping. 3. Solve these equations when pumping takes place in Cells 2 and 3 at rates of 4×106 m3/yr and 7×106 m3/yr, respectively.
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