FLOOD08745

• County: Statewide
• Community: Statewide
• Basin: Statewide
• Title: Colorado Flood Hazard Mitigation Plan
• Date: 12/1/1999
• Prepared For: State of Colorado
• Prepared By: Kistner and Associates
• Floodplain - Doc Type: Flood Mitigation/Flood Warning/Watershed Restoration

Colorado Flood Hazard Mitigation Plan -1999

Substantial Damage: shall mean a damage of any ori-
gin sustained by an obstruction whereby the cost of re-
storing the obstruction to rts before-damage condition
would equal or exceed 50 percent of the mar1<et value
of the obstruction before the damage occurred.

Substantial Improvement: shall mean any reconstruc-
tion, rehabilrtation, addrtion, or other improvement of an
obstruction, the cost of which equal or exceed 50 per-
cent of the market value of the obstruction before "start
of construction" of the improvement. This includes ob-
structions, which have incurred "substantial damage,"
regardless of the actual repair work performed. The
term does not, however, include erther (1) any project
for improvement of a structure or other obstruction to
correct existing violations of state or local heatth, sani-
tary, or safety code specWicalions which have been
identWied by the local code enforcement official and
which are the minimum necessary to assure safe living
condrtions, or (2) any atteration of a "historic structure,"
provided that the alteration will not preclude the struc-
ture's continued designation as a "historic structure."

Supplement: AA amendment to the hazard mrtigation
application to add or modify one or more mrtigation
measures.

Surcharge: means an increase in flood elevation due
to destruction of the floodplain that reduces its convey-
ance capacity.

Suspension: means the removal of a participating
community from the National Flood Insurance Program
(NFIP) because the communrty has not enacted and/or
enforced the proper floodplain management regulations
required for participation in the National Flood Insur-
ance Program (NFIP).

Variance: is a grant of relief to a person from the re-
quirements of Floodplain Management Standards,
which permrts construction in a manner otherwise, pro-
hibited by ordinance where specific enforcement would
result in unnecessary hardship, The granting of a vari-
ance does not remove the requirements for flood insur-
ance, which lending institutions will require W the struc-
ture is the collateral of a loan, Flood insurance rates will
be much higher for structures buitt below the Base
Flood Elevation,

Violation: means a failure of a structure or other devel-
opment to be fully compliant with the community's flood-
plain management regulations,

Watercourse: shall mean any depression two feet or
more below the surrounding land which serves to give
direction to a current of water at least nine months of
the year and which has a bed and well-defined banks,
(See Drainageway)

Watershed: (also called a Drainage Basin), It is that
area of land, which may contribute flow from runoff to a
particular watercourse,

Water Surface Profffe: (also referred to as Flood Ele-
vation Profile) means a graph showing the relationship
of water surface elevation to location, the latter gener-
ally expressed as a distance upstream from some refer-
ence point.

Wetlands: Those areas which are inundated or satu-
rated by surface or ground water wrth a frequency suffi-
cientto suppert, or that under normal hydrologic condi-
tions does or would suppert, a prevalence of vegetation
or aquatic IWe typically adapted for IWe in saturated or
seasonally saturated soil condrtions,

Write Your OWn (WYO) Program: is a cooperative
undertaking of the insurance industry and the Federal
Insurance Administration begun in October 1983, The
WYO Program operates within the context of the NFIP
and invotves private insurance carriers who issue and
service National Flood Insurance Program policies,

Colorado Emergency Management Plan: The plan
which is developed and continuously maintained by the
Director of the Office of Emergency Management
Agency (OEM) for the purpose of coordinating the
emergency management actrvrties of mrtigation, prepar-
edness, response and recovery wrthin the state,

Zone A (Unnumbered): are Special Flood Hazard Ar-
eas subjeclto inundation from the 100-Year flood, Be-
cause detailed hydraulic analyses have not been per-
formed, no base flood elevation or depths are shown.
Mandatory flood insurance purchase requirements ap-
ply,
Zone AE and A1-30: are Special Flood Hazard Areas
subject to inundation by the 100-Year flood determined
in a Flood Insurance Study by detailed methods. Base
flood elevations are shown within these zones, Manda-
tory flood insurance purchase requirements apply,
(Zone AE is used on new and revised maps in place of
Zones A 1-30,)

Zone AH: are Special Flood Hazard Areas subjeclto
inundation by 100-Year shallow flooding (usually areas
of pending) where average depths are between one
and three feet. Base flood elevations derived from de-
tailed hydraulic analyses are shown in this zone, Man-
datory flood insurance purchase requirements apply,

Zone AO: are Special Flood Hazard Areas subject to
inundation by 100-Year shallow flooding (usually sheet
flow on sloping terrain) where average depths are be-
tween one and three feet. Average flood depths derived
from detailed hydraulic analyses are shown within this
zone, Mandatory flood insurance purchase require-
ments apply,

Zone B, C, and X: are areas that have been identified
in the community flood insurance study as areas of
moderate or minimal hazard from principal source flood
in the area, However, buildings in these zones could be
flooded by severe, concentrated rainfall coupled wrth
inadequate local drainage systems, Flood Insurance is
available in participating communrties but is not re-
quired by regulation in these zones, (Zone X is used on
new and revised maps in place of Zones Band C,)

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Appendix A - 8

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