Board Meeting 10/01/1987

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

.

Memorandum/Issues/Rules
September 22, 1987

Rule 6. Standards for Approximate Information

This rule basically conforms to the pOlicy regarding
approximate information formally adopted by the Board at
its November, 1984, meeting. One of the main purposes in
designating approximate information was to recognize FEMA's
unnumbered A zones where some counties (Eagle, La Plata,
and Weld) felt official status was necessary in order to
comply with FEMA rules for continued participation in the
NFIP.

Proposed Rule 6.B, Hydrology, requires that, at a
minimum, the peak discharge for the 100-year flood be
determined. This is intended to help make future analysis
less costly to a developer who may be required by local
ordinances to preform a detailed analysis in order to
develop property shown in the approximate floodplain.

Rule 7. Criteria for Analvzinq Dams

.

This rule has been written to address an issue that has
developed regarding Standley Lake in Westminster. It
incorporates the latest thinking and policy statements of
the UD&FCD as stated in their Resolution No. 36, Series of
1986 - POlicy for the Delineation of Floodplains Below
Water Supply and Other Non-Flood Control Reservoirs. The
rule takes into account the current Colorado law concerning
liability for damages resulting from the flow of water from
a reservoir. This law states that no reservoir owner
"shall be liable for allowing the inflow to such a
reservoir to pass through it into the natural stream below
such reservoir" (Section 37-87-104(2) CRS).

Rule 8. Criteria for Analvzinq Levees

This rule has been written to establish statewide policy on
how to delineate areas that appear to be protected by
levees. The wording and intent has been primarily derived
from FEMA rules and regulations, Section 65.10, Mapping of
Areas Protected by Levee Systems.

Rule 9. Desiqnation and Approval

.

Proposed Rule 9.B, Base Flood, establishes the 100-year
flood (see definition 22) as the basis for regulation of
floodplains in Colorado for zoning purposes. Current
statutes regarding the CWCB duties do not consistently
refer to the magnitude of the regulatory floodplain as the
100-year flood. However, the 100-year flood has been
adopted as a national standard by FEMA for administration

-10-