Farmersville, TX Environmental Rules: Flood Elevation Requirements (2026)

Section 26-80 sets Farmersville's specific floodplain construction standards wherever base flood elevation data exists under section 26-25. New construction and substantial improvement of a residential structure must have the lowest floor, including any basement, elevated to two feet above the base flood elevation, certified to the floodplain administrator by a registered professional engineer, architect or land surveyor under section 26-51(a)(3). Nonresidential buildings get an alternative: elevate the lowest floor the same two feet above base flood elevation, or floodproof the structure below that level so walls and utilities are substantially watertight and can resist hydrostatic and hydrodynamic loads, certified by a registered engineer or architect and recorded by the floodplain administrator.

Fully enclosed areas below the lowest floor used only for parking, building access, or storage must be designed to automatically equalize floodwater pressure, meeting a minimum of two openings on separate walls totaling at least one square inch of net area per square foot of enclosed space, with the bottom of each opening no higher than one foot above grade. Manufactured homes placed in Zones A1-30, AH, or AE outside an existing park must sit on a permanent foundation elevated so the lowest floor is also two feet above base flood elevation, anchored to resist flotation, collapse, and lateral movement. Violating any of these construction standards is a misdemeanor under section 26-78, fined up to $2,000 per violation with each day counted separately.