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FLOOD02948
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Last modified
1/25/2010 6:25:54 PM
Creation date
10/4/2006 11:21:44 PM
Metadata
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Floodplain Documents
County
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Stream Name
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Statewide
Title
Flood of 1997: Hazard Mitigation Team Report in Response to DR-1186-CO Flood Disaster in CO
Date
10/1/1997
Prepared For
State of Colorado
Prepared By
FEMA
Floodplain - Doc Type
Flood Documentation Report
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<br /> <br />ISSUE: <br />CS-2 Inadequate infrastructure for storm water and surface drainage <br /> <br />BACKGROUND: <br /> <br />The existing storm sewer and surface drainage retention infrastructure was not <br />adequate to contain severe storms ond / or channel storm woter into existing <br />drainage in many rural communities and urban areas. Design criterio that are <br />used for storm water control projects generally follow the 2 or 5 year. event <br />criteria. This design standard may need to be more flexible to consider critical <br />links and vulnerable sites. <br /> <br />RECOMMENDATIONS: <br /> <br />Local governments need to review and evaluate their existing storm water man- <br />agement plans and infrastructure to determine where improvements are neces- <br />sary. The review criteria for critical and vulnerable areas may need a higher <br />design criterion than the 2 or 5 year design to ensure total integrity of the entire <br />plan. <br /> <br /> <br />LEAD AGENCIES: <br /> <br />Local jurisdictions <br /> <br />FUNDING: <br />FEMA, DOLA, USACE, FHWA <br /> <br />SCHEDULE: <br /> <br />Studies - six months <br />Implementation of new design criteria- one to five years <br /> <br />ISSUE: <br />CS-3 Review and improve stream gage network <br /> <br />BACKGROUND: <br />Flood hydrology is essential to preparing floodplain maps that appropriately <br />guide local floodplain management efforts and properly warn people of the <br />flood risk they may face. Two methods for performing flood hydrology are: 1) <br />Statistical analyses of stream gage records on the stream(s) being studied, which <br />assumes that we have good gages and that they have been in place for a good <br />number of years (25 plus); 2) Rainfall-runoff modeling, which measures theo- <br />retical oraclual rainfall data and translates that rainfall mathematically into flow <br />on the stream system receiving the rainfall. The theoretical or actual rainfall data <br />is dependent on one or more accurate rain gages, which are limited in many <br />
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