BOARD02153

• Board Meeting Date: 9/10/2002
• Description: Flood Section - Consent Agenda Items 2 and 3 - Floodplain Information to be Designated
• Board Meetings - Doc Type: Memo

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STATE OF COLORADO

Colorado Water Conservation Board
Department of NaturaI Resources
1313 Sherman Streer, Room 721
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
www.cwcb.state.co.us

Bill Owens
Governor

MEMORANDUM

GregE. Walcher
Executive
Director

TO:

Colorado Water Conservation Board Members

FROM:

Rod Kuharich
Director

DATE:

Larry Lang, Chief, Flood Protection Section n ~
Tom Browning, P.E., Flood Protection sectio~

September 3,2002

Dan McAuliffe
Deputy Director

SUBJECT: Consent Agenda Items 2 and 3
September 10-12, 2002 Board Meeting
Flood Protection Section - Floodplain Information to Be Designated

. SUMMARY

Consent Agenda Items 2 and 3 include two floodplain studies/maps proposed for CWCB action. Staff
is requesting Board designation and approval for these items. A brief summary of the studies is
presented below.

CWCB staff performs technical reviews of floodplain information to assure the Board that the
information is in compliance with the requirements of the CWCB's "Rilles and regulations for the
designation and approval of floodplains and of storm or floodwater runoff channels in Colorado," 2
CCR 408-1. Furthermore, Sections 31-23-301 and 30-28-111, Colorado Revised Statutes, state that
legislative bodies of local jurisdictions may provide zoning regulations for land uses on or along any
storm or floodwater runoff channel or basin only after designation and approval by the CWCB. In
addition, Section 37-60-106(1)( c), Colorado Revised Statutes, directs the CWCB to designate and
approve storm or floodwater runoff channels or basins and to make such designations available to
legislative bodies of local jurisdictions.

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The CWCB's designation and approvals greatly assist local communities in meeting the statutory
requirements of the State and the regulatory requirements of the National Flood Insurance Program.
Floodplain information is broadly categorized as detailed or approximate using the following
definitions. Detailed floodplain information means floodplain information prepared using topographic
base maps, hydrologic analyses, and hydraulic calculations to arrive at precise water surface profiles
and floodplain delineations suitable for making land use decisions under statutorily authorized zoning
powers. Approximate floodplain information means floodplain information prepared using a
significantly reduced level of detail to arrive at a hazard delineation without water surface profiles.