Infiltration is the process of rainfall penetrating the ground surface into the soil over the pervious areas of Subcatchments.
InfoSWMM H2OMap SWMM InfoSWMM SA offers three choices for modeling infiltration:
Horton's Equation
This method is based on empirical observations showing that infiltration decreases exponentially from … Read the rest
Time of Concentration
The dialog box for estimating time of concentration using the Kirpich method is shown below.
· Unit System – English or SI unit.
· Solving Target – Choose time of concentration.
· Equations – Select one of the eight … Read the rest
3.4 Gradually Varied Flow
Discussions in the previous sections have focused on uniform flow hydraulics where flow depth y and flow velocity V remain constant along the channel. In this section, we consider gradually varied flow, which is a form of steady nonuniform flow characterized by gradual variations in flow … Read the rest
The reason for this blog: The following is an excerpt from the EPA manual Storm Water Management Model Reference Manual Volume III – Water Quality (PDF) which can be found here
Underdrains are used in the following LID Controls
Underdrains are either recommended or required when the natural … Read the rest