BOARD02518

• Board Meeting Date: 11/19/2001
• Description: CF Section - Referred Non-Reimbursable Investments Floodplain Mapping Program
• Board Meetings - Doc Type: Memo

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STATE OF COLORADO

Colorado Water Conservation Board
Department of Natural Resources
13]3 Sherman Street, Room 721
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
www.cwcb.state.co.us

Q

Bill Owens
Governor

Greg E. Walcher
Executive Director

MEMORANDUM

Rod Kuharich
CWCB Director

Dan McAuliffe
Deputy Director

TO:

Colorado Water Ctll.servation Board Members
t-(J
Larry Lang, P,E" Chief, Flood Protection Section

FROM:

DATE:

October 31,2001

RE:

Agenda Item 24.f, November 19-20 CWCB Meeting
Water Supply Planning and Finance, Referred Non-reimbursable Investments
Floodplain Mapping Program

Introduction
At the January 2001 meeting ofthe CWCB, the Board approved the staff recommendation to authorize
$250,000 from the Construction Fund for a floodplain mapping program in Colorado, Following the
General Assembly's approval of the 2001 Construction Fund Bill, staff is currently utilizing the non-
reimbursable funds to meet 5 separate floodplain mapping needs throughout the state, Staff is now
requesting additional funding to continue with much needed mapping studies,

Discussion

Background
The CWCB has an active floodplain identification program for the state's 16,000 miles of floodplains,
The state, in cooperation with many partners, has studied over 8,000 miles of stream reaches covering
90 percent of the developed floodplain areas in Colorado, The factors which might necessitate new
mapping studies or revised studies include:

I, "natural aging" of floodplain maps prepared many years ago,
2, changes to the floodplain resulting from large floods,
3, changes to the floodplain resulting from human activities in the floodplain,
4, changes in engineering and mapping techniques and/or data allowing improved accuracy in
studies, and
5, growth into floodplains previously unstudied,