Earth: An Introduction to Physical Geology (12th Edition)

Published by Pearson
ISBN 10: 0134074254
ISBN 13: 978-0-13407-425-2

Chapter 17 - Section 17.5 - Wells and Artesian Systems - Eye on Earth 17.3 - Page 514: 3

Answer

Today, wells that tap this aquifer do not flow freely at the surface because the pressure in the artesian aquifer has decreased over time. As thousands of additional wells tap into the aquifer to extract water, the pressure in the aquifer diminishes due to the increased water withdrawal. The water level in the wells drops, and pumping is necessary to lift the water to the surface. This depletion of pressure in the aquifer is a result of excessive groundwater pumping, leading to a decline in the artesian flow.

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