FEMA flood zone rules in Denver, CO — also called floodplain regulations or special flood hazard area (SFHA) rules — determine flood insurance requirements and elevation standards for new construction.
Denver regulates development in FEMA-designated flood hazard areas under DRMC Chapter 56, Article IV (Floodplain Management). Major flood risks in Denver center on the South Platte River, Cherry Creek, Harvard Gulch, Goldsmith Gulch, and Sanderson Gulch drainage basins. The Mile High Flood District (formerly Urban Drainage and Flood Control District) coordinates regional flood management.
DRMC §56-60 through §56-81 govern floodplain development. All construction within 100-year floodplains requires a Floodplain Development Permit from the Community Planning and Development department. New residential structures must have the lowest floor elevated to at least one foot above the Base Flood Elevation (BFE). Non-residential structures may be floodproofed as an alternative. Substantial improvements (exceeding 50% of market value) trigger full compliance. Denver participates in the National Flood Insurance Program (NFIP) and the Community Rating System (CRS).
Building in a floodplain without a permit violates DRMC Chapter 56 and can result in fines up to $999 per day. NFIP violations may result in denial of federally backed flood insurance and disaster assistance. The city can require removal of non-compliant structures. Property owners may face increased flood insurance premiums for non-compliance.
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