GIS for Watershed Modeling Exercise IV

Drainage line processing

This process converts the stream link grid into a drainage line feature class that we are familiar with (we normally represent rivers, streams as line features).

Select Terrain Preprocessing – Drainage Line Processing. Input the dialog as following:

Does the drainage line feature look the same as your hand calculated one?

Catchment Grid & Catchment Polygon

Catchment area is the region of land whose water drains into a specified drainage line.

Select Terrain Preprocessing – Catchment Grid Delineation

Use FlowDir and Lnk grids as input.

The catchment grid will be automatically added to the table of content.

From catchment grid (Cat), we can derive catchment polygon. From Terrain Preprocessing menu, select Catchment Polygon Processing:

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