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- U . S . Soil Conservation Service (SCS) Methods - <br /> Deterninacion of Peak Flows Within <br /> Colorado (1977 ) SCS :technical Note 50 . <br /> - HEC II Computer Program <br /> Procedures for Determining Peak Flows <br /> in Colorado - Soil Conservation Service <br /> Technical Release No . 55 . <br /> The California Method <br /> Colorado Water Conservation Board <br /> Technical Manual No . 1 <br /> Rational Method <br /> Manual for Estimating Flood Characteristics <br /> of Natural Flow Streams in Colorado . <br /> Additional data was obtained from the following literature <br /> sources : <br /> - National Oceanic and Atmospheric Administration <br /> (NOAA) Atlas - Precipitation Frequency Atlas of <br /> the Western United States , Volume III <br /> - Rainfall frequency Atlas of the United States for <br /> Durations from 30 Minutes to 24 Hours and Return <br /> Periods from 1 to 100 years . <br /> C . Description of the Coal Creek watershed <br /> The primary stream in Coal Basin is Coal <br /> Creek, a perennial stream, tributary to the Crystal River . <br /> This stream drains an area of approximately 26 . 6 square <br /> �g <br />