FLOOD09803

• County: Summit
• Community: Cripple Creek
• Stream Name: Colorado River
• Basin: Colorado Mainstem
• Title: Floodplain Management Study Cripple Creek
• Date: 9/1/1992
• Prepared For: CWCB
• Prepared By: CWCB
• Floodplain - Doc Type: Floodplain Report/Masterplan

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INVESTIGATIONS AND ANALYSIS

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A. Frequerlcy arid DischargE

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The 10-, 25-, 50-, and 1elO-year flood events are used as the flood
frequencies for this flood plain analysis. Thus, the data developed
in this r"eport wi I I be suitable not only for regulation purposes, and
H.B. 1041 designation but Is also consistent with Federal Insurance
Administration flood insurance studies corlducted by the Federal
Emer'sency Manasement Agerlcy.

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T~lese various flood events have an average occurrence of once in the
nlJmber (If years as indjcated~ For example, the lOO-year flood occurs,
on t~le average, once in a 10(l-yeat" period, and has a one percent
chance of being equaled or exceeded in any given year.

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T~le partlcula~ uses for the var~ous flood events In addition to those
sta.t:ed abl)Ve at-e as f"o II ows:

IO-year, 25-year and 50-year Flood Events

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Infot-rnation t"egatMding the.,;.€' lowet" f"t"equency floods is especially
useful for future engineering stud~es and land use planning purposes
related to minor road systems, minor channel improvements, the
lqcation of pat"ks and t"ect-eational fae i I ities, aSt-icultut"al lands, and
appurterlant strIJctut"es. The use of the lower frequency floods may be
considered in planrlins flood prevention projects to protect
agt- i cu I tUt"a I at-eas, Ot- othetW pt-oper"ty whet"e t- i sk to Ii f"e is not a
fac tOt".

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l(lO-year Flood Event

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The I(H)-yeat" flood event may be used in lieu of !1)Wet" ft-equenc i es fot-
engineering design purposes where greater security from structure
fa i lur- e i s de sit" e d .

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However", the most i rnpot"tant use i)f the !(H)-yeat. f I Clod event lies in
flood plairl managemerlt and land use planning as set forth in the state
statutes. The State of Colorado and the Federal Government consider
the 100.-year frequency flood as the flood event to be used in
designing and protecting structures and dwel I lnss for human
occupation. Therefore, al I flood plain regulations at-e based upon the
lO(J-.yt?&r- flood.

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