Posted 7/2/2022 21:13 (#9731238 - in reply to #9730895) Subject: RE: Increasing my drainage coefficient on tiled ground..........
C IL
In the Midwest we get Type II rainfall which is generally modeled as log normal for design storms. There are some shortcuts which interpret the lognormal form as an asymmetrical triangle.
Type 1 rainfall is monsoon-type gentle steady-rate rainfall and Type III is what the SW gets and I forget the hydrograph shape.