Transcription of Chapter 6 Runoff - udfcd.org
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Chapter 6 Runoff - udfcd.org
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.
The quantity of stormwater runoff from an urban site is also related to site characteristics (e.g., lot size, soil type, slope, vegetation, impervious area) and stormwater measures used to control runoff from the
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