Land Uses are categories of activities or land surface characteristics that are assigned to catchment elements. Examples of land use activities are residential, commercial, industrial, and undeveloped. Land surface characteristics might include roof tops, lawns, paved roads, undisturbed soils, etc. Land uses are used solely to allow spatial variation in pollutant buildup and washoff rates.

You have complete freedom in defining land uses and assigning them to catchment elements. One approach is to assign a mix of land uses to each subcatchment, in which case all land uses in the subcatchment will have the same pervious/impervious characteristics. If this is not appropriate, the user can create subcatchments that have just a single land use classification along with a set of pervious/impervious characteristics that reflects the classification.

Access this dialog box by selecting Components > SWMM Extensions > Land Uses.

This dialog box contains a toolbar, a list pane on the left that displays all of the land uses that have been defined in the current model, and three tabs on the right that together permit the values to be defined for the land use that is currently highlighted in the list pane.

The toolbar contains the following buttons:

The right side of the dialog contains the following tabs: