Figure 9. Water use in Southern Nevada from 1900 to 2008. Note that groundwater use started to decline and surface water use increased steadily from 1971 onward, when distribution of Colorado River water for municipal use began. Prior to that, CO River withdrawals were limited to a few industrial uses. Note that from around 1990 to present, withdrawals from Lake Mead have exceeded Nevada’s 300,000 acre-foot allotment (see text).
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