There are Four factors in Rainfall Dependent Infiltration and Inflow or RDII in SWMM 5
There are Four factors in Rainfall Dependent Infiltration and Inflow or RDII in SWMM 5 : 1. The fractional response to Rainfall or R from 0 to 1 2. The Time Base of the Unit Hydrograph or T in hours * Dimensionless K Shape Factor 3. The Sewershed Contributing Area in acres or hectares and 4. The Maximum, Initial Abstraction and Recovery Rate for R on a Monthly Basis in units of inches, mm or mm/day, 5 . The fifth and probably the most important factor is the Rainfall