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Grand Prairie staff detail flood-warning upgrades and new notification tools
Summary
City staff told council the city operates 23 flood gauges, three verbal flood-warning sirens in English and Spanish, and uses Everbridge and IPAWS to push alerts; staff outlined two-tier alert triggers and post‑event inspection procedures.
Noreen Housewright, Grand Prairie—s director of engineering and utility services, and Chase Wheeler of Grand Prairie Fire presented the city—s flood-warning system and severe-weather protocols, saying the city operates 23 owned gauges, two city floodgates on Cottonwood Creek, three verbal flood-warning sirens and multiple flashers to warn motorists.
Housewright said the city—s system integrates National Weather Service watches and warnings with local tools including Everbridge/Alert GP and IPAWS wireless emergency alerts, and noted the city—s Community Rating System (CRS) score is a class 4, which provides residents an estimated 30% discount on flood insurance.
Wheeler explained operational thresholds the city uses to escalate response: an initial alert triggers when water is about 1.5 feet below a roadway to prompt readiness, and a critical alert is issued when water reaches the roadway but has not overtopped it, triggering road barricading and deployment of stormwater, streets and emergency crews. Staff said notifications go to 911 dispatch, streets, signal operations, GP fire and CMO and council; site updates are provided hourly until roads reopen, and post-event inspections and documentation are required before reopening.
Council members asked about siren range and language: Wheeler said the three verbal sirens broadcast English and Spanish messages and are designed to penetrate structures; larger sirens cover roughly a one-mile radius and a smaller unit about a quarter-mile. He also warned that federal rules limit some uses of mass-notification systems — for example, certain 911 data and non-emergency events cannot be pushed to IPAWS unless criteria are met — but said the city will use Everbridge and IPAWS for eligible events and that residents and businesses may subscribe to Alert GP for phone, text or email alerts.
The presentation closed with staff describing coordination steps when alerts arrive: stormwater confirms messages, deploys crews to close roadways, and coordinates with marketing and utilities for public messaging. Staff said the city documents and photographs sites after water recedes to ensure creeks are clear and infrastructure is safe before reopening.
