Transcription of Chapter 6 Runoff - UDFCD
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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.
using data collected for a variety of watershed conditions. The vast majority of major drainage systems within UDFCD are designed based upon the hydrology calculated using CUHP and a customized version of the EPA’s Stormwater Management Model (SWMM) , runoff block, named the Urban Drainage Stormwater Model (UDSWM).
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