Catchment properties can be input in the Spread Input. Users have to click on “Catchment” before inputting the catchment properties.

Import Catchment #

Under the Catchment section, click on the “Import Catchment” and select the layer that represents your catchment and click “Import”.

MISC #

Users can input the catchment properties in the Misc tab by selecting the particular catchment.

Spread Input #

It is easier for users to input the catchment properties by clicking the “Spread Input”.

Drain #

Represents the drain into which the catchment’s runoff will flow, represented by the arrow on the Input Plan.

Area #

Represents the area of the catchment, which can be computed by software based on the closed polygon drawn or user-defined by users.

To define your own area, users need to change the User Defined column from NO to YES.

Runoff Coefficient #

Calling out the Runoff Coefficient table, users can click on the ‘…’ button.

Then, users can click the coefficient value to apply it to the catchment.

Overland Flow #

Users can let the software compute the Overland Flow time by defining the Slope and Roughness.

These values can be input directly under the respective columns, or users can call out the overland dialog by clicking the ‘…’ button.

How to remove/add a vertex and move a corner  #

Remove/Add Vertex #

Click on ‘Catchment’, then click “Add/Remove Vertex”.

To remove the vertex, select the catchment’s vertex. Then, hover the vertex and click-once to remove it.

To add a vertex, click on the catchment’s edge once and click again to add vertex.

Move Corner #

Click on “Move Corner”, then select the corner and click once again to move it (Until the snap cursor is showing).