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Last modified
11/23/2009 12:58:12 PM
Creation date
10/4/2006 10:14:09 PM
Metadata
Fields
Template:
Floodplain Documents
County
Larimer
Community
Larimer County
Stream Name
Big Thompson River
Title
Evaluation of the Flood Hydrology in the Colorado Front Range Using Streamflow Records and Paleoflood Data for the Big Thompson River Basin
Date
5/1/1986
Prepared For
USGS
Prepared By
USGS
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />In the second method, flood frequency estimates are calculated through <br /> <br /> <br />rainfall-runoff modeling. Rainfall and runoff data are collected at a <br /> <br /> <br />site, and the hydrologic response of the basin (in terms of loss rates, <br /> <br /> <br />unit-hydro graph coefficients, and routing) is established. Then, by using <br /> <br /> <br />the modeled basin and long-term rainfall records, long-term runoff records <br /> <br /> <br />and, subsequently, flood-frequency relations can be determined. <br /> <br />Flood-frequency estimates are used for flood-plain management and the <br /> <br /> <br />design of structures in the flood plain. For example, current practices <br /> <br /> <br />for the design of high-hazard dams include protection against severe <br /> <br /> <br />short-term precipitation of approximately 1 to 72 hours in duration, termed <br /> <br /> <br />probable maximum precipitation (PMP). The basic guideline used in estab- <br /> <br /> <br />lishing these criteria for design of dams in Colorado is a publication of <br /> <br /> <br />the U.S. Bureau of Reclamation (1973). The PMP magnitudes are based on the <br /> <br /> <br />hydrometeorological processes that generate extreme floods, Careful <br /> <br /> <br />consideration is given to the meteorology of storms that produce these <br /> <br /> <br />major floods in the United States and include features, such as quantity of <br /> <br /> <br />rainfall, dew-point temperatures, and depth-area-duration (D-A-D) values, <br />produced by these storms, The D-A-D values for different areas then can be <br /> <br /> <br />maximized hypothetically by maximizing the factors affecting rainfall to <br /> <br /> <br />estimate an appropriate PMP value, A recent report establishes revised PMP <br /> <br /> <br />values in the Front Range of Colorado (Miller et aI" 1984). <br /> <br />7 <br /> <br />
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