BOARD00723

• Board Meeting Date: 11/15/2005
• Description: Flood Section - Consent Agenda - Designation and Approval of 100-year Floodplain Information, Fountain Creek and Monument Creek Flood Hydrology - Pueblo, El Paso, and Teller Counties, October 2005
• Board Meetings - Doc Type: Memo

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STATE OF COLORADO

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

MEMORANDUM

Bill Owens
Governor

TO:

Colorado Water Conservation Board Members

Russell GeorJle
Executive Director

FROM:

Tom Browning, P.E., Chief, Flood Protection Section

RodKuharich
CWCB Director

DATE:

November 3, 2005

Rick Bmwn
Acting Deputy Director

SUBJECT: Consent Agenda Item 2
November 14-16, 2005 Board Meeting
Designation and Approval of lOO-year Floodplain Information: Fountain Creek and
Monument Creek Flood Hydrology - Pueblo, EI Paso, and Teller Counties, October 2005

BACKGROUND

a Consent Agenda Item 2 includes a flood hydrology analysis proposed for CWCB action. Staff is requesting
. Board designation and approval for this updated hydrologic analysis. The newly calculated flood flows
will be utilized for upcoming Map Modernization floodplain studies in Pueblo, EI Paso and Teller
Counties, and municipalities within those three counties. Once completed, the new floodplain studies will
supersede the current floodplain studies, which are based on hydrologic analyses that have become
outdated. When the new studies have been prepared, the current floodplain studies will be proposed for
rescission by the Board, and the new floodplain studies will be proposed for designation in their place. A
briefsl1mmary of the hydrologic analysis is presented below.

CWCB staffperforms technical reviews of floodplain infonnation to assure the Board that the information
is in compliance with the requirements of the CWCB's ''Rules and regulations for the designation and
approval of floodplains and of stonn or floodwater runoff channels in Colorado," 2 CCR 408-1.
Furthennore, 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 stann 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 stonn or floodwater runoff
channels or basins and to make such designations available to legislative bodies of local jurisdictions.

The CWCB's desiguation 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 intormatiOIl. is broadly categorized as detailed or approximate using the following definitions.
Detailed floodplain infonnationmeans floodplain infonnation prepared using topographic base maps,
a hydrologic analYs...es, an.. dhydraulic calculations to arrive at precise water surface profiles and floodplain
. delineations suitable for making land use decisions under statutorily authorized zoning powers.
Approximate floodplain infonnation means floodplain infonnation prepared using a significantly reduced

Colorado Water Conservation Board
Flood Protection. Water Supply Planning and Finance. Stream and Lake Protection
Water Supply Protection . Conservation and Drought Planning