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America's water: Agricultural water demands and the response of groundwater
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2016
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Source: Geophysical Research Letters, 43(14), 7546-7555
[PDF-8.49 MB]
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Journal Title:Geophysical Research Letters
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Description:Agricultural, industrial, and urban water use in the conterminous United States (CONUS) is highly dependent on groundwater that is largely drawn from nonsur ficial wells ( >30 m). We use a Demand-Sensitive Drought Index to examine the impacts of agricultural water needs, driven by lowprecipitation, high agricultural water demand, or a combination of both, on the temporal variability of depthto groundwater across the CONUS. We characterize the relationship between changes in groundwaterlevels, agricultural water de ficits relative to precipitation during the growing season, and winter precipitation. We find that declines in groundwater levels in the High Plains aquifer and around the Mississippi River Valley are driven by groundwater withdrawals used to supplement agricultural waterdemands. Reductions in agricultural water demands for crops do not, however, lead to immediate recoveryof groundwater levels due to the demand for groundwater in other sectors in regions such as Utah,Maryland, and Texas. 1. Introduction Over a third of global freshwater withdrawals are sourced from aquifers [ Stolp and Brooks , 2009; Siebert et al .,
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Source:Geophysical Research Letters, 43(14), 7546-7555
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DOI:
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ISSN:0094-8276;1944-8007;
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Rights Information:Other
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