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DWR pilots post-fire alluvial-fan flood forecasting with FEMA funds to guide emergency response

2505953 · March 5, 2025
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Summary

DWR described pilots that combine lidar, soil testing and NOAA radar to forecast post-fire alluvial-fan flooding in three basins, aiming to give emergency responders site-specific rainfall thresholds that indicate imminent fan flooding risk.

The Department of Water Resources presented a small budget request tied to FEMA hazard-mitigation funding to pilot post-fire alluvial-fan flood forecasting in three basins: a Mono County basin, a basin in Monterey County and an alluvial-fan area in northern Los Angeles County (Angeles National Forest).

DWR described technical work completed to date: LIDAR mapping, soil characterization by the…

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