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<br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />Flood Hydrograph package (HEC-l), Hydrologic <br />Engineering Center, U.S. Army Corps of Engineers. <br />Urban Storm Drainage Criteria Manual, Volumes I <br />and II, Denver Regional Council of Governments. <br />Storm water Management Model (SWMM). Environ- <br />mental Protection Agency, U.S. Army Corps of <br />Engineers has provided modifications. <br />National Engineering Handbook, Section 4 Hydrol- <br />ogy, U.S. Department of Agriculture, Soil Conser- <br />vation Service. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />For ungaged (see Glossary) rural areas, the hydrol- <br />ogist should use a regional analysis approach. This <br />approach involves developing representative regres- <br />sion curves for the region based on available re- <br />gional gage records for both ~ainfall and snowmelt. <br />Acceptable procedures are: <br /> <br />. <br /> <br />Guidelines for Determining Flood Flow Frequency, <br />U.S. Water Resources Council, Bulletin i17A. <br />Manual for estimating Flood Characteristics of <br />Natural-Flow Streams in Colorado, Colorado Water <br />Conservation Board, Technical Manual #1. <br />Procedures for Determining Peak Flows in Colo- <br />rado, U.S. Department of Agriculture, Soil <br />Conservation Service, March 1977. <br /> <br />. <br /> <br />. <br /> <br />-21- <br />