Rapides Parish, LA Environmental Rules: Flood Zones (2026)

Section 10½-5 limits the flood damage prevention chapter to areas of special flood hazard within Rapides Parish outside incorporated municipalities, matching the parish's role as unincorporated-area regulator. Section 10½-16 then lays out general standards that apply to all new construction and substantial improvements in those hazard areas: structures must be designed and adequately anchored to prevent flotation, collapse, or lateral movement from hydrodynamic and hydrostatic loads and buoyancy; built and constructed by methods and materials that minimize and resist flood damage; and fitted with electrical, heating, plumbing, and HVAC equipment located or designed to keep water out during flooding.

New and replacement water supply and sanitary sewer systems must be designed to keep floodwater from infiltrating the system, and on-site waste disposal systems must be sited to avoid contamination or impairment during a flood. Section 10½-20 adds floodway-specific rules: encroachments, including fill and new construction, are prohibited within an adopted regulatory floodway unless an engineering analysis shows no increase in flood levels during the base flood discharge. Section 10½-13 designates the Rapides Area Planning Commission as floodplain administrator, reviewing every permit application against these standards and confirming that other required federal, state, or local approvals, including Clean Water Act Section 404 permits, have been obtained.