xpdrainage 2017.1 Help Documentation XDH2017v1

Area inflows can be applied to the system using the Area Inflow type.



An area can be entered directly or calculated automatically from the polygon drawn on the Plan. 

Volumetric Runoff Coefficient

Used to factor the runoff when the Time Area Diagram or Time of Concentration Runoff Methods are selected. 

Runoff Method

The preferred runoff methods can be selected - select from the methods below for details and required input parameters.

Time of Concentration



Time Area Diagram

FSR Unit Hydrograph

FEH Unit Hydrograph

ReFH Unit Hydrograph


Click the links below for details on the other tabs.


Land Use

Rainwater Tank

Workflow - What's next...?

Connect Inflows to your Stormwater Control, specify Inlets or Outlets or connect to another Stormwater Control or Junction.

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