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Commission hears calls to revisit drought assumptions and flags uncertainties on regional groundwater project
Summary
Public commenters and stakeholders urged the SFPUC to reexamine drought planning using new tree‑ring analyses and to provide a clearer schedule and yield estimate for the regional groundwater storage and recovery project; staff said a promised report has been supplied but that technical challenges and unclear yields remain.
Speakers at the commission’s public‑comment period and in the communications segment pressed staff to reexamine water‑supply assumptions and to provide clearer schedules and yield estimates for groundwater projects.
Dave Warner (Palo Alto) asked staff to review a tree‑ring analysis of Tuolumne River flow data spanning 1,100 years and to reassess the drought planning model that is based on the 1987–92 drought plus a 2.5‑year cushion. Warner said his preliminary application of the model to the…
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