Record Upper Colorado River Basin water use in 2011

According to the U.S. Bureau of Reclamation’s new Consumptive Uses and Losses Report (pdf), consumptive use of Colorado River water in the states of the upper basin (Colorado, New Mexico, Utah, Wyoming and a sliver of Arizona) reached 4.281 million acre feet in 2011, the highest on record. The previous high was 4.245 million acre …

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fifty years of drought

From Jonathan Overpeck last month in Nature (gated): The complexity of these megadroughts still defies complete explanation and yet it implies that unusually persistent anomalies of sea surface temperature can combine with amplifying changes in vegetation and soil to drive droughts that — if they happened today — would outstrip many of our institutional capacities …

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Declining westerlies and Pacific Northwest hydrology: a hypothesis

Charlie Luce from the U.S. Forest Service’s Boise Aquatic Sciences Laboratory and colleagues have a paper in the most recent Science examining the question of whether declining westerlies are behind the changing snowpack in the mountains of the Pacific Northwest: Decreases in lower-tropospheric winter westerlies across the region from 1950-2012 are hypothesized to have reduced …

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Municipal and agricultural use of Colorado River water: a comparison

Henry Brean reports on lawn removal efforts in Las Vegas, Nev.: Since the turf rebate program was launched in 1999, it has paid out $189 million in rebates and helped eliminate more than 167 million square-feet of thirsty grass, saving an estimated 9 billion gallons of water per year. Translated: a reduction of approximately 4,000 …

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