Book Title: Groundwater Resource Development

Authors: Leonard Konikow and John Bredehoeft

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Book Description: When a well is pumped, the discharge is balanced by some combination of an increase in recharge, a decrease in other groundwater discharge from the aquifer, and a reduction in groundwater storage in the aquifer system. This book explains the interrelation among these factors and how they can be estimated. The authors describe the historical magnitude of groundwater use and its relation to the depletion of groundwater in storage in aquifers, as well as conditions that allow sustainable groundwater development.

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Book Description

Groundwater withdrawals expanded dramatically during the last half of the 20th century. Approximately half the population of the world depends upon groundwater for its drinking water supply, and groundwater supplies almost half of the water used for irrigation in agricultural areas. This large and expanding use of groundwater is the primary driving force for concerns about groundwater (aquifer) depletion and sustainability of groundwater pumping.

When a water-supply well is drilled, it is usually with the hope that the well will reliably provide water for a long time (that is, its use will be sustainable for future generations). This book presents the principles associated with development of groundwater at the macro scale. These ideas date back to a classic paper by C.V. Theis in 1940 on the source of water derived from wells, in which he noted that all pumpage is balanced by a loss of water somewhere, with the loss during early times coming largely from aquifer storage and at later times increasingly from capture, which includes increases in recharge and decreases in discharge (such as base flow to streams and evapotranspiration).

Groundwater is often characterized as a “renewable resource.” Yet data now accumulating indicate that much of the current development of groundwater is depleting the resource at rates that cannot be sustained—in many places groundwater is being “mined” at high rates—contradicting its renewability over human timeframes. This poses a challenge to groundwater scientists and managers–can the resource be developed in a sustainable manner, and if so, how can that goal be accomplished?

The desirability and value of sustainable development of groundwater is clear. If the groundwater storage depletion over time becomes negligible, then groundwater withdrawals are maintainable indefinitely (as long as other factors do not affect the aquifer’s water balance). But “sustainability” should be assessed in a larger perspective than just whether pumping can continue indefinitely—the assessment should include impacts on surface-water flows, other environmental consequences (e.g., land subsidence and water-quality changes), as well as other linkages, such as socio-economics.

Hydrogeologists have the knowledge and tools to understand and predict the magnitude and timing of these effects. The most effective tool is a well-calibrated numerical simulation model, through which hydrogeologists can develop understanding and quantitative assessments of complex aquifer systems. Thereby, hydrogeologists can provide predictive understanding, which offers a long-view scientific basis for policy makers and water managers to make sound and defensible policy decisions.

Authors

Leonard Konikow and John Bredehoeft

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Groundwater Resource Development Copyright © 2020 by The Authors. All Rights Reserved.

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Title
Groundwater Resource Development
Authors
Leonard Konikow and John Bredehoeft
License

All rights reserved. This publication is protected by copyright. No part of this book may be reproduced in any form or by any means without permission in writing from the authors (to request permission contact: permissions@gw-project.org). Commercial distribution and reproduction are strictly prohibited.

Publisher
The Groundwater Project
Publication Date
October 27, 2020