Catchment Properties Tab (Catchment Properties Dialog Box)

You can use the Catchment Properties tab to change the Reference Pipe Network Structure. The Catchment Properties tab also displays several read-only properties for the catchment.

Catchment

Discharge Point
Displays the specified discharge point of the catchment. If you defined the flow path from a polyline, this is the downhill end point of the selected flow path polyline. If you defined the flow path from a surface, this is the discharge point you selected in the drawing.
Exclusionary
Specifies whether a catchment will exclude other catchments.

Exclusionary catchments exclude any other catchments within the same Catchment Group whether the other catchments are exclusionary or not. If a catchment is exclusionary, its boundary (and flow path) can be modified either by existing catchments as it is being created or by new catchments as they are being created.

As a catchment is created, it will check all other catchments within the same Catchment Group for two situations:

  • If another catchment is exclusionary, and if the new catchment has some (or all) of its boundary within it, the other exclusionary catchment will exclude the new catchment from itself.
  • If the new catchment is exclusionary, and if the other catchment has some (or all) of its boundary within it, the new catchment will exclude the other catchment from itself.
Reference Pipe Network

Displays the name of the pipe network that contains the pipe network structure you select in the Reference Pipe Network Structure list.

Reference Pipe Network Structure

Optionally specifies the pipe network structure to use as a reference for the catchment.

Note: Catchments can be associated with a single pipe network structure. The reason for making this association is to enable catchment data to be exported to Storm and Sanitary Analysis. When catchments are associated with a structure, they can be exported and converted into a Storm and Sanitary Analysis subbasin. With no association, however, catchment data cannot be exported.
Catchment Group Name
Displays the group in which the catchment was created. To change the catchment group, you can use the Move To Catchment Group command.
Reference Surface
Displays the surface upon which the catchment area was calculated. If the catchment was creating using the Create Catchment From Object command, this value is <none>.
Important: The surface associated with a catchment cannot be changed after the catchment is created. The catchment does not update dynamically if the surface changes after the catchment is created. However, you may select another surface to use for calculating flow paths when using the Edit Flow Segments command.