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FLOOD04002
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Last modified
1/25/2010 6:44:58 PM
Creation date
10/5/2006 12:16:07 AM
Metadata
Fields
Template:
Floodplain Documents
County
Jefferson
Community
Golden, Jefferson County
Stream Name
Clear Creek
Basin
South Platte
Title
Major Drainageway Plan - Clear Creek: Youngfield Through Golden
Date
2/1/1982
Prepared For
UDFCD
Prepared By
Wright-Mclaughlin Engineers
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />rV-ll <br /> <br />SECTION V <br /> <br />o Highest priority for open space land shall be the acquisition of land <br />along streams and major draindge~ays. <br /> <br />HYDROLOGICALS'JMMARY <br /> <br />o NOndeyelopdble land such as the hogback formations, geologic hazards, <br />steep slopes and floodplains shall be preSerYad and bedeyeloped for <br />ped es t r i an , eque s t r i an and b i eye 1 e t r ail s connect i ng sc ~IOO 1 s . open <br />space,parksandneighborlloods. <br /> <br />GENERAL COM~ENTS <br /> <br />The basic components necessary for the develop1lent of anydrainagewayplan- <br />ning study are themagnitLKIe and frequency of storm water runoff. This in_ <br />cludestheyolumeofrunoff,aswell as the peak rates of flow for the flood <br />events under consideration. The frequency of a flood ;s indicated by its <br />return period, and functionally, is inversely proportional to the return <br />period. The return period is defined <lS the average interval of time within <br />wnichagiveneyentwill be equalled or exceeded once. Thus, afloodnaving <br />a return periOd of5 years has a 20 percent probability of being equa lledor <br />exceeded in any given year. Likewise, a flood having a return period of lOO <br />years nasal percent probability of being equalled or exceeded in any given <br />year. <br /> <br />The magnitude of a flood can be judged by its maximum rate of flow, or peak <br />discharge. The extent of flooding and tilt: sizing and character of m<ljor <br />drai nage oIQrks dnJ oth~r urban storm drainage faen ities are determ~ned by <br />the magnitude of runoff. Any major drainageway plan must be based on ade- <br />Quate andthorougM hydrological studies if the plan is to have a signifieant <br />Y<llut.' and a firm factual basis. <br /> <br />HYDROLOGY FOR CLEAR CREEK <br /> <br />Ihp h.Ydrological information "no corresponding flood discharges needed to de- <br />termine the extent of flooding on Clear Creek were prodded bJ the ()nahd <br />District of the U.S. Army Corps of Engineers (U.5.A.C.E.). Peak discharge- <br />frequency relationships were determined at many locations for f lood events of <br />10.50,100, and 500.year return perioos. These oischarges are based upon <br />1977 de.'elo~ent and future deve1op1lent conditions projected for the Clear <br />Creek basin. <br />
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