Board Meeting 10/01/1987

• Board Meeting Date: 10/1/1987
• Description: CWCB Meeting
• Board Meetings - Doc Type: Meeting

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Memorandum/Issues/Rules
September 22. 1987

the standards such as contained in Subpart C
of this part. In some instances. community
officials may have access to information or
knowledge of conditions that require.
particularly for human safety. higher
standards than the minimum criteria set forth
in Subpart A of this part. Therefore. any
flood plain management regulations adopted by
a State of community which are more
restrictive than the criteria set forth in
this part are encouraged and shall take
precedence."

Subpart C of 60.22. CFR. cited above states in
part:

"In formulating community development goals
and in adopting flood plain management
regulations. each community shall consider at
least the ... adverse effects of flood plain
development on existing development "

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Colorado counties have the authority to adopt a Master Plan
which may include plans for the development of a drainage
basin in all or portions of the county or region (Section
30-28-106(d). CRS).

Proposed Rule 5.B.5. Detention. could pose a problem for
private entities that are required by local governments to
provide detention in order not to increase runoff above
historic peak discharges. An understandable argument is
why should a developer be required to build a detention
pond if government won't give it any credit? However. the
problem lies in a demonstrated lack of any significant long
term maintenance by private entities of such private
facilities.

The proposed rules are silent on the following hydrologic
issues:

a. expected probability (a statistical refinement used by
the COE but not allowed by FEMA)

b. mixed populations (how to handle flooding types from
more than one source. such as rain and snow)

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c. adjustments in the stream gage records for historic
flow or "outliers" (high or low)

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