FLOOD01015

• County: Fremont
• Community: Florence
• Stream Name: Coal Creek, Arkansas River
• Title: Flood Preparedness Plan for the City of Florence Remont County, Colorado
• Date: 6/1/1993
• Prepared For: Florence, Fremont County, CWCB
• Prepared By: US Army Corps of Engineers
• Floodplain - Doc Type: Flood Mitigation/Flood Warning/Watershed Restoration

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flow (in cfs) at the Canon City gage. '1'h" gag.. transmits every
4 hours but during emergencies can be programmed to transmit
every 15 minutes. The hotline requires a division and station
#. The required inputs are division 2 and station 64 followed
by an asterisk (*). However"a large flood event will probably
wash the gage away, so keep this in mind.

In addition, the Colorado Division of Water Resources in
, Canon City has responsibility for this gage, and can also
provide stage and other information. Their phone number is
, 719-275-1003.

As previously stated, there is approximately 2 hours of
travel time for a flood crest at Canon City to reach the City
of Florence. By calling the hotline (updated every 4 hours),
this information may be useful in establishing a flood travel
time. HOWEVER, CONTRIBUTING DRAINAGE nCH THE LARGE AREAS
DOWNSTREAM OF CANON CITY SHOULD ALSO BE INCLUDED IN THE ANALYSIS.

4. identify the level of threat for purposes of warning
dissemination and for selection of emergency response actions.

3.6 Levels of Flood Threat

The 25 and 100-year floodplains developed for the
Arkansas River at Florence are used to identify the levels of
flood threat (reference 1). Flows between the 10-year and
25-year flood event are identified as Levell (shown as a blue
zone). Flows from the 25 to 100-year event are identified as
Level 2 (shown as a red zone).

Plates 4-11 show the flood zones along the Arkansas
River located within the Florence City Limits co=esponding to
the different levels. The flood zones are divided for each
inundation area and are color coded for ease of recognition.

It is important to note that future and/or observed
conditions be considered when choosing the level of threat.
For example, if the Weather Service forecasts the flood to
reach thd blue flood zone, but is not expected to crest in the
red, then evacuation of the red zone may not be required.
Also, if stream watchers are observing higher flow conditions
than what the NWS has predicted, the higher level of threat
should be used.

In addition, these maps reflect conditions as they were
in 1977. Houses and other facilities built since 1977 are not
shown on the map, but are listed on the address notification
list shown in the Appendices C and D. However, this also is

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lO-Year to 25.
Year Event

25-Year to
100-Year Evanl