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<br />analysis ill accordance with rule 5.B.2.a <br />and a comparison with similar watersheds. . <br /> <br />c. When from 10 to 24 years of streamflow <br />records are available. the hydrologic <br />analysis shall include a statistical <br />analysis in accordance with 5.B.2.a. <br />comparisons with similar watersheds. and <br />flood estimates using hydrologic models <br />and precipitation records. <br /> <br />The following methodologies. and any other <br />methods approved by the Board. are <br />acceptable in a synthetic analysis. <br /> <br />1) The Rational Method for <br />basins less than 160 acres. <br /> <br />drainage <br /> <br />2) "Flood Hydrograph Package (HEC-l) , " <br />Hydrologic Engineering Center. U. S. <br />Army Corps of Engineers. <br /> <br />3) "National Engineering Handbook, <br />Section 4. Hydrology." U.S. Department <br />of Agriculture, Soil Conservation <br />Service, 1985. <br /> <br />4) "Computer Program for Pro j ect . <br />Formulation. Hydrology, Technical <br />Release 20." U.S. Department of <br />Agriculture. soil Conservation <br />Service. 1983. <br /> <br />5) "Urban Hydrology for Small Watersheds. <br />Technical Release 55." U.S. Department <br />of Agriculture. Soil Conservation <br />Service. June. 1986. <br /> <br />6) '''Colorado Urban Hydrograph Procedure, <br />Urban Storm Drainage Criteria Manual. <br />Volumes I and II." Denver Regional <br />Council of Governments, 1984. <br /> <br />7) "Runoff Block of the Storm Water <br />Management Model (SWMM). Version 2," <br />Environmental Protection Agency as <br />modified by the Missouri River <br />Division of the U.S. Corps of <br />Engineers. <br /> <br />. <br /> <br />-12- <br />