Board Meeting 11/15/1984

• Board Meeting Date: 11/15/1984
• Description: Minutes, Agenda, Memorandums November 15, 1984
• Board Meetings - Doc Type: Meeting

APPENDIX C
STATE OF COLORADO
COLORADO WATER CONSERVATION BOARD .
Department of Natural Resources
4 JT
321 State Centennial Building :
1313 Sherman Street
Denver, Colorado 80203
Richard D.Lamm
Phone: [phone] Governor
M O R A N D U M O rector McDonald
-, r.
David W.Walker
Deputy Director
TO: Members, CWCB
FROM: Bill McDonald
DATE: November 8 , 1984
SUBJECT: Agenda Item 9, November 15, 1984, Board Meeting--
Policy Concerning Designation of Approximate
Floodplains
Introduction:
The Colorado Water Conservation Board is, by statute,
responsible for approving and designating 100-year floodplains.
• These designations are a prerequisite for the implementation of
floodplain zoning by local governments (towns/cities and counties) .
To date, 235 resolutions have been enacted by the Board which have
designated and approved approximately 3200 miles of the state' s
100-year floodplains and channels.
These designations have heretofore been, with a few
exceptions, based on detailed hydrologic and hydraulic engineering
studies using state of the art techniques. This has resulted in
as accurate a determination of flood discharges, water depths and
velocities, and areal extent of flooding as could reasonably be
required. The standards for the performance of floodplain studies
and for the Board 's subsequent designations have been established
by the Board pursuant to statute.
A review and recitation of the Board ' s statutory authorities
may be found in the attachment to this memo.
Discussion
With cutbacks in state and federal funding for detailed
floodplain studies, some local governments are requesting that the
CWCB designate and approve approximate 100-year floodplains in
order that they can exercise their zoning powers. By
"approximate," it is meant that one or more of the parameters which
go into the delineation of a floodplain ( i.e. , base mapping detail ,
•
APPENDIX C 718
• - pol/con