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Johnson County advances enhanced flash‑flood warning system using local radar, sensors and targeted alerts
Summary
Emergency management laid out a plan to combine neighborhood‑scale CASA radars, public surveys and pressure‑transducer sensors at low‑water crossings so threshold‑based alerts will notify staff and precinct supervisors to verify flooding and preemptively close roads; hardware is roughly $4,000 per sensor and an initial 10‑unit bundle’s ongoing connectivity is estimated at about $750 annually.
Marshall Moore, Johnson County’s emergency‑management director, presented a multi‑phase plan to improve flash‑flood detection and public notification by combining local radar data, historic incident mapping and field sensors.
Moore explained the county’s partnership with the CASA‑DFW network and the University of Massachusetts Amherst to obtain neighborhood‑scale dual‑polarization radar data that fill gaps left by regional NEXRAD coverage. Using archived radar records and the county’s Facebook postings of flooded roads, staff compiled a map of low‑water crossings and analyzed rainfall case studies to develop threshold values (for 15‑minute…
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