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Central Valley staff outline CV‑SWAT modeling and township targets to inform groundwater protection
Summary
Central Valley Water Board staff described how grower‑reported INMP/INMP datasets and CV‑SWAT/PSAT modeling produce township loading estimates that underlie groundwater protection values and five‑year reassessable targets, and explained outreach and interim drinking‑water measures in priority areas.
Central Valley Regional Water Quality Control Board staff told the State Water Resources Control Board’s agricultural expert panel on Nov. 14 that farmer‑reported irrigation and nitrogen management reports, combined with a Central Valley adaptation of the SWAT model (CV‑SWAT) and a steady‑state flow tool (PSAT), are the foundation for township‑scale loading estimates and locally tailored groundwater protection targets.
"We run the model for 38 years ... and then we take the average of the last 30 years," said Ken Miller of Formation Environmental, describing the team’s approach to smoothing year‑to‑year variability in nitrate leaching estimates. Eric Warren, program manager for the Central Valley Water Board’s Irrigated Lands Regulatory Program, said the model outputs remain "fundamentally tied to the grower summary report…
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