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High and DryMeeting the Challenges of the World's Growing Dependence on Groundwater$
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William M Alley and Rosemarie Alley

Print publication date: 2017

Print ISBN-13: 9780300220384

Published to Yale Scholarship Online: September 2017

DOI: 10.12987/yale/9780300220384.001.0001

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Not All Aquifers Are Created Equal

Not All Aquifers Are Created Equal

(p.68) 5 Not All Aquifers Are Created Equal
High and Dry

William M. Alley

Rosemarie Alley

Yale University Press

This chapter examines how geology and climate create vastly different groundwater situations. Effective management of groundwater depends upon full consideration of these differences. The chapter begins with a distinction between confined and unconfined aquifers and a look at artesian wells, with a focus on Australia’s Great Artesian Basin. The characteristics of different rock types are illustrated by four basic aquifer rock types in sub-Saharan Africa. The chapter then turns to non-renewable aquifers in North Africa and Saudi Arabia. The fast-recharging Edwards Aquifer in Texas then provides a quite different story with its sensitivity to short-term climate variability and concerns about endangered species. The chapter concludes with a discussion of saltwater intrusion in coastal aquifers and the potential of brackish groundwater for water supply.

Keywords:   aquifer rock types, artesian well, brackish groundwater, Edwards Aquifer, non-renewable aquifers, saltwater intrusion

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