Agenda Date: 03/19/2019
Subject:
Title
Resolution 21-2019: Adopting the Urban Drainage and Flood Control District's Flood Hazard Area Delineation report for Big Dry Creek downstream of County Line Road, dated February 2018
Body
Presented By:
Keith Reester, Public Works Director
POLICY QUESTION:
Does city council support adoption of the Urban Drainage and Flood Control District (UDFCD) Flood Hazard Area Delineation (FHAD) report for Big Dry Creek downstream of County Line Road, dated February 2018?
BACKGROUND:
The floodplain for Big Dry Creek in Littleton was first mapped and shown on Federal Emergency Management Agency (FEMA) Flood Insurance Rate Maps (FIRM) dated December 1, 1978. Littleton has participated in the National Flood Insurance Program (NFIP) since then. Big Dry Creek was again studied as part of an Urban Drainage and Flood Control District FHAD study in 1996, which then became the basis of the FEMA floodplain delineation on the FIRM.
In late 2013, UDFCD began a re-study of Big Dry Creek in light of significant development in the Highlands Ranch area and constructed drainage way improvements since the 1996 FHAD. A new FHAD study was finalized in February 2018 for Big Dry Creek downstream of County Line Road to the South Platte River. A portion of this floodplain is within the Littleton city limits.
Periodically, updates are made to floodplain delineations and regulations, and local governments are required to adopt these revisions in compliance with State floodplain regulations and the NFIP. At the State level, floodplains are regulated by the Colorado Water Conservation Board (CWCB). UDFCD and the CWCB have recently adopted the new study and its floodplain delineation (April 2018 and January 2019, respectively) and have requested the City of Littleton also adopt the new study so the same information is used by all local governments for floodplain regulatory purposes. CWCB floodplains supersede FEMA data when regulating at the local...
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