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FLOOD05827
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FLOOD05827
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Last modified
1/25/2010 7:07:01 PM
Creation date
10/5/2006 1:49:30 AM
Metadata
Fields
Template:
Floodplain Documents
County
Boulder
Community
Boulder
Stream Name
Boulder Creek
Basin
South Platte
Title
Boulder Creek Phase B
Date
12/1/1979
Prepared For
Boulder
Prepared By
UDFCD
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />The structures preliminarily identified by the United States Army Corps <br />of Engineers for relocation and/or flood-proofing are delineated on the <br /> <br />1 inch z 200 foot plan mapping presented in this report. <br /> <br />analysis; prepared two reports entitled "Erosion, Sedimentation and <br /> <br />Debris Analysis of Proposed Boulder Creek Floodway" and "Erosion, <br /> <br />Sed.imen-tation and Debris Analysis of Do Nothing Condition, Boulder Creek" in <br />1979. <br /> <br />C. BOULDER CREEK EARLY FLOOD WARNING & EVACUATION PLAN <br />The Urban Drainage and Flood Control District, City of Boulder, Boulder <br />County and the University of Colorado have developed a flood warning <br />plan for Boulder Creek. The purpose of the warning plan is to reduce <br /> <br />loss of 1 ife through early detection of a flood threat and dissemination <br /> <br />of warnings to the public. Some reduction in flood damage may be <br /> <br />possible during slow rising floods, but that is considered a secondary <br /> <br />purpose of the plan. As of this writing, the plan has not been com- <br /> <br />pletely implemented but it is expected to be fully functional by April, <br />1980. <br /> <br />These reports document their analysis of the impacts of sediment and <br /> <br />debris on existing conditions and on the proposed floodway exclusively <br /> <br />upstream of 17th Street using state-of-the-art technology and pro- <br /> <br />cedures; coupled with Ors. Simon's and Li's extensive experience. <br /> <br />The plan consists of three parts: (l) detection and evaluation of the <br /> <br />flood threat, (2) dissemination of the warning, and (3) response to the <br />warning. All three parts of the plan must function properly or the plan <br />will fail. Only a brief description of the plan is presented in this <br />report. More detailed information is contained in the Boulder Creek <br /> <br />Flood Warning Plan, copies of which may be obtained from City of Boulder, <br /> <br />Boulder County or the Urban Drainage and Flood Control District. <br /> <br />Simons and Li have concluded that the proposed excavated floodway will <br /> <br />provide significant flood protection for the City of Boulder over <br />existing conditions and will not increase potential problems associated <br /> <br />with sediment and vegetative debris. However, the proposed floodway <br /> <br />plan will not totally eliminate the potential sediment problem and the <br />remaining debris problems are significant. <br /> <br />O. STATEMENT ON SEDIMENT AND DEBRIS <br />In conjunction with this Phase B Preliminary Design Report, Ors. Simons <br />and Ruh-Ming Li of Water and Environment Consultant Inc., noted authori- <br /> <br />ties on river mechanics, erosion and sedimentation, and river systems <br /> <br />Ors. Simons and Li have recommended that further studies of the ex- <br />cavated floodway concept be conducted as follows: <br />a. The impacts of the passage of the 500-year flood on the <br />excavated floodway should be determined. <br />b. Modified channel designs should be considered to alleviate <br />possible problems associated with aggradation and degradation. <br />c. The impacts of the proposed excavated floodway plan on the <br /> <br />reach downstream of 17th Street should be determined. <br /> <br />Drs. Simons and Li have made the following recommendation with respect <br /> <br />to the proposed excavated f]oodway: <br /> <br />9 <br />
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