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GSA consultants recap regional conjunctive-use work; pilot clearing relieved local flooding, Twin Spill could yield ~1,200 acre-feet
Summary
Consultants updated the GSA on a regional conjunctive-use program that pairs flood diversions and South Feather surface-water conveyance to reduce groundwater pumping. A Polarmo-area maintenance pilot cleared about 1.3 miles of ditch for roughly $100,000 and produced anecdotal flood relief; the Twin Spill project could provide about 1,200 acre-feet of groundwater benefit if implemented.
Consultants for the We Do Creek Groundwater Sustainability Agency presented a two-part recap on March 19 that tied short-term pilot maintenance to longer-term regional conjunctive-use planning.
Becky Fairbanks, the GSA project manager, summarized work funded by grants and described a Polarmo-area pilot that cleared roughly 1.3 miles of drainage from Aena Avenue to Railroad Avenue to reduce localized flooding and to help the agency learn permitting procedures. “It cost about $100,000, including the administration work, permitting and implementation,” Fairbanks said.
Larry Walker Associates’ consultant Ryan Fulton described the overall regional conjunctive-use concept: convey excess surface water from Polarmo floodwater and South Feather Water & Power…
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