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Chapter 6 Runoff - UDFCD

August 2018 Urban Drainage and Flood Control District 6- i Urban storm Drainage Criteria Manual Volume 1 Chapter 6 Runoff Contents Overview .. 1 Rational Method .. 2 Rational Formula .. 2 Assumptions .. 3 Limitations .. 4 Time of Concentration .. 4 Initial or Overland Flow Time .. 5 Channelized Flow Time .. 5 First Design Point Time of Concentration in Urban Catchments .. 6 Minimum Time of Concentration .. 6 Common Errors in Calculating Time of Concentration .. 6 Rainfall Intensity .. 7 Runoff Coefficient .. 7 Colorado Urban Hydrograph Procedure .. 13 Background .. 13 Effective Rainfall for CUHP .. 13 Pervious-Impervious Areas .. 13 Depression Losses .. 14 Infiltration .. 14 CUHP Parameter Selection .. 16 Rainfall .. 16 Catchment Description .. 16 Catchment Delineation Criteria .. 18 Combining and Routing Subcatchment CUHP Hydrographs.

3. The EPA’s Storm Water Management Model (SWMM), mostly for combining and routing the hydrographs generated using CUHP, 4. Use of published runoff information, and 5. Statistical analyses. Most of this chapter focuses on the Rational Method and CUHP in combination with SWMM routing. Table 6-1 provides a summary of applicability for both methods.

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