Use to generate sanfrancisco (not official) hyetographs required for SWMM5.
Alternating Block Method
Ref. Chow, Applied Hydraulics


  • Paste to SWMM5 input file directly under [TIMESERIES]









  • For example: using 0.3 as peak fraction for a 24 hour rainfall duration puts the peak at 7.2 hours from the beginning.