Name the two types of groundwater aquifers. Describe how they differ.What type of aquifer generally occurs closest to the land surface (i.e. is shallowest in the subsurface)?In an unconfined aquifer, what physical boundary does the piezometric surface correspond to?

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Name the two types of groundwater aquifers. Describe how they differ.

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter9: In Situ Stresses

Section: Chapter Questions

Problem 9.13P

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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

Name the two types of groundwater aquifers. Describe how they differ.
What type of aquifer generally occurs closest to the land surface (i.e. is shallowest in the subsurface)?
In an unconfined aquifer, what physical boundary does the piezometric surface correspond to?

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Subject: Geotechnical engineering - soil mechanics
A confined aquifer of 15 m constant thickness is sandwiched between two aquicludes as shown in the figure. (not drawn to scale) Piezometer P 55.2m Piezometric Surface m Aquiclude Aquifer Aquiclude L = 2500m Piezometer Q TTTTTR 34.1m 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