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FLOOD05818
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Last modified
1/25/2010 6:50:21 PM
Creation date
10/5/2006 1:49:06 AM
Metadata
Fields
Template:
Floodplain Documents
County
Jefferson
Community
Golden
Stream Name
Clear Creek
Basin
South Platte
Title
Hydrology Study of Clear Creek Between Wadsworth and Federal Boulevard
Date
4/1/1977
Prepared For
Jefferson County
Prepared By
Colorado Division of Highways
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />I 76-1(35). PE <br /> <br /> <br />This Manual directs that a 50-year to lOa-year frequency flood will be <br />the basis for design. Realizing the immense amount of property which <br />is subject to flood damage, potential loss of life, cost of traffic <br />delays and the established flood plain ordinances by the contiguous <br />municipalities, the lOa-year flood will be the basis for hydraulic <br />design. <br /> <br />Method of Analysis <br /> <br />Stream Gages - Stream gages are basic in estimating peak stream flow. <br />Preferably several of the gages are located on the stream to be studied. <br />Fortunately two such gages exist on Clear Creek: gage 6-7195 near <br />Golden, Colorado with 77 years of record, and gage 6-7200 near the <br />mouth with 48 years of record. Two other gages 6-7165 and 7170 also <br />on Clear Creek are too far upstream to be included in this study. <br />See Figure No.2. <br /> <br />While these gages have a long history, some hydrologists feel that these <br />gages do not reflect the true flood potential of Clear Creek. (See <br />U. S. Corps of Engineers letter of August 14, 1975 in Appendix.) Figure <br />No. ,3 is a plot of drainage area versus discharge for these two gages. <br />Note that the discharge decreases with increasing drainage area. This <br />anomaly is due to the irrigation diversions and excessive detention <br />potential in the many sand and gravel pits along the broad flood plain. <br />Since some of these pits are being reclaimed for land development, we <br />can anticipate that some of the detention effects will be diminished. <br /> <br />The evaluation of other stream gages with similar basin characteristics <br />and good records is essential to either check or support the Clear <br />Creek gages. Gages meeting the following criteria were also studied: <br /> <br />a. The drainage basin originated in mountainous terrain. <br /> <br />b. The stream gage was located within 50 miles of this <br />study reach. <br /> <br />c. The drainage area below elevation 7500 feet was between <br />10 and 200 square miles, <br /> <br />d. The peak flows were not substantially ftffected by diversion <br />or regulation. <br /> <br />e. The gage had at least 10 years of record. <br /> <br />Only six gages were found to meet these criteria. <br /> <br />3 <br />
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