The Inflow Hydrograph may be defined by the user as an Input Hydrograph or may be calculated from the Runoff Method selected when using a Catchment Area. Each Runoff method is described in detail under these headings.
The hydrograph will first reach an inlet, either to a Simple Junction, Manhole or Stormwater control. The Inlet may restrict the flow based on a range of methods described via links to the Inlet types on the Inlet page. There may be multiple inlets which are treated separately and then summed to create the total inflow into the Junction, Manhole or Stormwater Control.
The computation routine used to calculate the outflows and the updated volume is derived from the Modified Puls method.