Floodplain and Stormwater Management

Public Notice for Case No. EE20-006: The Arapahoe County Public Works and Development Department, in accordance with National Flood Insurance Program regulation 65.7(b)(1), hereby gives notice of the County’s intent to revise the flood hazard information, generally located between East Bayaud Ave and Gun Club Road. Specifically, the flood hazard information shall be revised along Coal Creek from a point approximately 300 feet downstream of E-470 to a point approximately 600 feet upstream of E-470. Get the complete notice here.

Floodplain Management

Review and evaluate building and construction activities adjacent to FEMA and community regulated floodplains. Floodplain Management staff issues Floodplain Development Permits within the county's jurisdiction. Staff coordinates floodplain activities with the Federal Emergency Management Agency (FEMA) to ensure that Arapahoe County complies with the National Flood Insurance Program (NFIP) to remain in good standing.  



Master Planning

Stormwater Master Planning is completed in conjunction with Federal Emergency Management Agency (FEMA), Southeast Metro Stormwater Authority (SEMSWA) and Urban Drainage and Flood Control District (UDFCD).

Stormwater Quality

To reduce the sediment and chemical load on the State’s waters, Arapahoe County implements and enforces a Stormwater Management Program to satisfy the applicable water quality requirements of the Clean Water Act. A program description document is available to the public for review and comment.

Public Education

  • Southeast Metro Stormwater Authority (SEMSWA) provides stormwater management services for drainage and flood control facilities within its service areas in the City of Centennial and unincorporated Arapahoe County
  • Stormwater Permittees for Local Awareness of Stream Health (SPLASH) provides educational outreach, opportunities for public participation, and staff training to increase awareness of each person's role in protecting water quality
  • Cherry Creek Stewardship Partners promotes open space, recreation and water quality within the Cherry Creek Watershed.