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SFPUC hydrologic modeling finds runoff declines in most climate scenarios; supply impacts to be modeled
Summary
SFPUC staff told commissioners that a new hydrologic sensitivity analysis of Hetch Hetchy runoff shows declines in most scenarios, earlier runoff timing and substantial snow‑storage losses later in the century; operations modeling to translate runoff changes into water‑supply impacts is scheduled for summer 2012.
SAN FRANCISCO — The San Francisco Public Utilities Commission heard on the record that a newly calibrated hydrologic model for the Hetch Hetchy watershed projects lower runoff in nearly all examined climate scenarios and a shift in runoff timing that could reduce late‑spring and summer flows.
David Behar, Climate Program director for the Water Enterprise, summarized a sensitivity analysis based on six climate scenarios and said: "Runoff declines in all of the scenarios that we…
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