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FLOOD03824
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Last modified
1/25/2010 6:44:27 PM
Creation date
10/5/2006 12:05:34 AM
Metadata
Fields
Template:
Floodplain Documents
County
Statewide
Stream Name
South Platte, Arkansas, Colorado
Basin
Statewide
Title
Annual Snowmelt and Rainfall Peak Flow Data on Selected Foothills Region Streams, South Platte River, Arkansas River, and Colorado River Basins Colorado
Date
1/1/1982
Prepared By
USGS
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />ANNUAL SNOWMELT AND RAINFALL PEAK-FLOW DAT~ ON <br />SELECTED FOOTHILLS REGION STREAMS, SOUTH PLATTE RIVER, <br />ARKANSAS RIVER, AND COLORADO RIVER BASINS, COLORADO <br /> <br />By John G. Elliott, Robert D. Jarrett, and John L. Ebling <br /> <br />ABSTRACT <br /> <br />Peak flows in the foothills region of Colorado are attributable to two mete- <br />orologic sources--snowmelt and rainfall. As part of a study of the hydrology of <br />foothills streams in Colorado, charts from streamflow gages on unregulated streams <br />were examined to determine the source of peak-flow events. Snowmelt-runoff peaks <br />were distinguished from rainfall-runoff peaks on the basis of daily and seasonal <br />occurrence, hydrograph shape, and local weather conditions. Peak-fiow data for <br />snowmelt runoff and rainfall runoff are presented for 69 streamflow-gaging sta- <br />tions in the South Platte River, the Arkansas River, and the Colorado River <br />basins. <br /> <br />INTRODUCTION <br /> <br />A realistic determination of the magnitude and frequency of floods is essen- <br />tial in the design of structures, land"use planning, identification of flood- <br />hazard areas, and studies involving streamflow characteristics. Peak flows for <br />ungaged watersheds or those with short periods of record are estimated with a re- <br />gional flood-frequency analysis which utilizes data collected in gaged watersheds <br />of similar climatic and geomorphic setting. Regional flood-frequency analysis has <br />been performed for Colorado streams by Patterson (1964; 1965), Patterson and <br />Somers (1966), Matthai (1968), McCain and Jarrett (1976), and Livingston (1970, <br />1981). <br /> <br />The foothills region of Colorado is defined as the rugged terrain between <br />high mountainous areas and plains, or plateaus, areas. Peak-flow events in this <br />region may be produced by either melting of the snowpack or rainfall runoff, This <br />mixed population of flood events complicates flood hydrology and attempts at con- <br />ventional flood-frequency analysis. For this reason a study to identify the unique <br />character of the foothills region flood hydrology has been undertaken. The study <br />was conducted in cooperation with the U.S. Army Corps of Engineers, Albuquerque, <br />Omaha, and Sacramento Districts; the U.S. Bureau of Reclamation, Salt Lake City, <br />Utah; the Colorado Water Conservation Board; and the Urban Drainage and Flood Con- <br />trol District, Denver, Colo. <br />
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