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GSA committee reviews annual reports showing storage deficits, and recommends adopting Chachilla demand-management and subsidence measures
Summary
Presentations summarized spring 2025 groundwater contours and storage changes showing multi‑thousand-acre-foot deficits in both subbasins; the committee voted to recommend adoption of the Chachilla subbasin groundwater demand management and subsidence mitigation report to the full board.
Committee members on April 7 received annual-report highlights for the Madera and Chachilla subbasins and recommended adoption of the Chachilla groundwater demand management and subsidence mitigation report.
John Davids of Davids Engineering walked the committee through groundwater contour and change maps and summarized storage outcomes for spring 2025. He reported a noted overdraft in the Madera subbasin upper aquifer of about 64,000 acre‑feet and an upper‑aquifer deficit of about 41,000 acre‑feet in the Chachilla subbasin. For lower aquifers, Davids reported roughly a 6,500 acre‑foot deficit in the Madera lower aquifer and just over 21,000 acre‑feet in the Chachilla lower aquifer. Davids described spring 2025 as a below‑normal…
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