All development in the City of Grand Prairie needs local and state permits. The City’s ordinances and building codes guide and regulate construction in floodplains. Without these provisions, flood insurance through the National Flood Insurance Program (NFIP) would not be available. Any development in the floodplain without a permit is illegal and should be reported to the Stormwater Department at 972-237-8141.

The City of Grand Prairie participates in the National Flood Insurance Program (NFIP). As a participating community, the City has adopted Floodplain Management practices through several ordinances that severely limit the development allowed in the 1% annual chance floodplain (the area inundated by a storm that has a 1% chance of occurring in any year).

The City of Grand Prairie standards require all new structures be constructed 2.0 feet above the 1% annual chance flood elevation, or 1.0 foot above the "ultimate" water surface elevation, whichever is higher.

Mobile homes are required to be 3.0’ above the 1% annual chance flood elevation.

When developing along a major creek within the City of Grand Prairie, the developer must submit a Flood Study to the City showing the 1% annual chance floodplain and water surface elevation based on both current land-use and future land-use assumptions. For property with any portion located within the 1% annual chance floodplain, regardless of structure location, a flood insurance policy may be required by the mortgage lender.

The City Stormwater Department is available to make site visits to review flooding issues, drainage and sewer problems, and provide one-on-one advice to property owners pertaining to development, renovation, and flood protection measures.