An aquifer has three different formations. Formation A has a thickness of 30 ft and a hydraulic conductivity of 7.0 ft/day. Formation B has a thickness of 15 ft and a conductivity of 78 ft/day. Formation C has a thickness of 22 ft and a conductivity of 17 ft/day. Assume that each individual formation is isotropic with a longitudinal

An aquifer has three different formations. Formation A has a thickness of 30 ft and a hydraulic conductivity of 7.0 ft/day. Formation B has a thickness of 15 ft and a conductivity of 78 ft/day. Formation C has a thickness of 22 ft and a conductivity of 17 ft/day. Assume that each individual formation is isotropic with a longitudinal

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter2: Geotechnical Properties Of Soil

Section: Chapter Questions

Problem 2.8P

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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

Description
An aquifer has three different formations. Formation
A has a thickness of 30 ft and a hydraulic
conductivity of 7.0 ft/day. Formation B has a
thickness of 15 ft and a conductivity of 78 ft/day.
Formation C has a thickness of 22 ft and a
conductivity of 17 ft/day. Assume that each
individual formation is isotropic with a longitudinal
mixing coefficient, DL= 0.1 cm2/day and
homogeneous and hydraulic gradient is 1ft/1000 ft.
a. If a conservative contaminant is spilled how far
would you expect it to travel in each formation
before its concentration is exactly ½ of its
concentration?

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