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<br />. <br /> <br /> <br />COLORADO STATEWIDE <br />DRAINAGE AND FLOODPLAIN MANAGEMENT CRITERIA MANUAL <br /> <br />CHAPTER 5 <br />HYDROLOGY <br /> <br />SECTION 2.0 <br />RUNOFF <br /> <br />TABLE OF CONTENTS <br /> <br />SECTION 2.0 <br />RUNOFF <br /> <br />2.1 INTRODUCTION ............................................................................................... CH5-203 <br />2.2 RATIONAL METHOD ........................................................................................ CH5-203 <br />2.2.1 METHODOLOGy...... ....... ............ ........................ ....... ............... .......... ........ CH5-204 <br /> <br />2.2.2 ASSUMPTIONS ................. ..................... ..... ......... .............................. ......... CH5-204 <br /> <br />2.2.3 LIMITATIONS ON METHODOLOGy.......................................................... CH5-204 <br />2.2.4 TIME OF CONCENTRATION - RATIONAL METHOD............................... CH5-204 <br />2.2.4.1 TIME OF CONCENTRATION IN NON-URBANIZED BASiNS........... CH5-205 <br />2.2.4.2 TIME OF CONCENTRATION IN URBANIZED BASINS .................... CH5-206 <br />2.2.5 RAINFALL INTENSITY ................................................................................ CH5-207 <br />2.2.6 RUNOFF COEFFICIENT ............................................................................. CH5-207 <br />2.2.7 APPLICATION OF THE RATIONAL FORMULA METHOD........................ CH5-208 <br />2.2.8 MAJOR STORM ANALySiS........................................................................ CH5-208 <br />2.3 SCS UNIT HYDROGRAPH METHOD .............................................................. CH5-208 <br />2.3.1 METHODOLOGy....................... ................. ................... .............. ....... ......... CH5-209 <br /> <br />2.3.2 ASSUMPTIONS ..... ............................... .... ... ..... .... ... ... .............. ........ ... ........ CH5-209 <br /> <br />2.3.3 LAG TIME .................................................................................................... CH5-210 <br /> <br />2.3.3.1 ROUGHNESS FACTOR...................................................................... CH5-211 <br />2.3.4 UNIT STORM DURATION........................................................................... CH5-211 <br />2.3.5 PRECIPITATION LOSSES.......................................................................... CH5-211 <br />2.3.5.1 SCS CURVE NUMBER....................................................................... CH5-212 <br />2.3.6 SUB-BASIN SiZiNG..................................................................................... CH5-213 <br />2.3.7 ROUTING OF HYDROGRAPHS................................................................. CH5-214 <br />2.3.8 RESERVOIR ROUTING OF HYDROGRAPHS .......................................... CH5-215 <br />2.3.8.1 MODIFIED PULS ROUTING METHOD.............................................. CH5-215 <br />2.4 COLORADO URBAN HYDROGRAPH PROCEDURE (CUHP) ....................... CH5-216 <br /> <br />2.5 EXAMPLES. .......... ............ .......................... ........... .............. ........ .......... ... ........ CH5-216 <br /> <br />2.5.1 EXAMPLE: RATIONAL FORMULA METHOD ........................................... CH5-216 <br />2.5.2 EXAMPLE: SCS UNIT HYDROGRAPH METHOD (HEC-1)...................... CH5-219 <br />2.5.3 EXAMPLE: COLORADO URBAN HYDROGRAPH PROCEDURE (CUHP)CH5-220 <br /> <br />. <br /> <br />. <br /> <br />CHAPTER 5 <br />HYDROLOGY <br /> <br />AUGUST 2002 <br /> <br />RUNOFF <br /> <br />CH5-201 <br />