Figure : changing-groundwater

Depletion of Groundwater in Major U.S. Regional Aquifers

Figure 3.2

Columbia University
Upmanu Lall

This figure appears in chapter 3 of the Impacts, Risks, and Adaptation in the United States: The Fourth National Climate Assessment, Volume II report.

(left) Groundwater supplies have been decreasing in the major regional aquifers of the United States over the last century (1900–2000). (right) This decline has accelerated recently (2001–2008) due to persistent droughts in many regions and the lack of adequate surface water storage to meet demands. This decline in groundwater compromises the ability to meet water needs during future droughts and impacts the functioning of groundwater dependent ecosystems (e.g., Kløve et al. 201438d66cb7-6270-4fa1-8e12-215ddb0a37c5). The values shown are net volumetric rates of groundwater depletion (km3 per year) averaged over each aquifer. Subareas of an aquifer may deplete at faster rates or may be actually recovering. Hatching in the figure represents where the High Plains Aquifer overlies the deep, confined Dakota Aquifer. Source: adapted from Konikow 2015.35520257-6694-45bb-a0bf-bd14ba88a77c Reprinted from Groundwater with permission of the National Groundwater Association. ©2015.

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This figure was created on September 22, 2017.

This figure was submitted on November 23, 2018.

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