a) A well for extracting water from a confined aquifer was installed at a site. The top of the confined aquifer was at a depth of 10 m and the bottom was at a depth of 17 m. When the well was first installed the water level rose to 3 m below the ground surface, prior to the installation of any pumps. Observation wells were installed 50 m and 150 m radially out from the centre of the extraction well. i) At a pumping rate of 3000 litres/hour the water levels in the observation wells were 5 m and 4 m below the ground surface, respectively. Calculate the coefficient of permeability of the confined aquifer. ii) Calculate the radius of influence of the extraction well. iii) What is the minimum depth that the observation wells would have to be installed to?

a) A well for extracting water from a confined aquifer was installed at a site. The top of the confined aquifer was at a depth of 10 m and the bottom was at a depth of 17 m. When the well was first installed the water level rose to 3 m below the ground surface, prior to the installation of any pumps. Observation wells were installed 50 m and 150 m radially out from the centre of the extraction well. i) At a pumping rate of 3000 litres/hour the water levels in the observation wells were 5 m and 4 m below the ground surface, respectively. Calculate the coefficient of permeability of the confined aquifer. ii) Calculate the radius of influence of the extraction well. iii) What is the minimum depth that the observation wells would have to be installed to?

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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Concept explainers

Groundwater Flow

The term groundwater refers to the water which is found beneath the earth's surface. Pores present in the soil and rocks with fractures make a passage for rainwater to enter the earth's surface and deposit as groundwater. The flow nature and direction of groundwater under the earth's surface directly impacts the strength and compressibility of the soil, which reflects its ability to support structural loads.

Question

a) A well for extracting water from a confined aquifer was installed at a site. The top of the confined
aquifer was at a depth of 10 m and the bottom was at a depth of 17 m. When the well was first installed
the water level rose to 3 m below the ground surface, prior to the installation of any pumps.
Observation wells were installed 50 m and 150 m radially out from the centre of the extraction well.
i) At a pumping rate of 3000 litres/hour the water levels in the observation wells were 5 m and 4 m
below the ground surface, respectively. Calculate the coefficient of permeability of the confined aquifer.
ii) Calculate the radius of influence of the extraction well.
iii) What is the minimum depth that the observation wells would have to be installed to?

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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…