Option

Description

Impervious Area (%)

Percentage of land area which is impervious.

Impervious Roughness (N)

Manning's n for overland flow over the impervious portion of the subcatchment.

Impervious Depression Storage (mm)

Depth of depression storage on the impervious portion of the subcatchment. (Typical Values)

Pervious Roughness (N)

Manning's n for overland flow over the pervious portion of the subcatchment.

Pervious Depression Storage (mm)

Depth of depression storage on the pervious portion of the subcatchment. (Typical Values)

Subarea% Zero Impervious

Percentage of impervious area with no depression storage.

Subarea Routing

Choice of internal routing of runoff between pervious and impervious areas:

• Impervious - Runoff from pervious area flows to impervious area.

• Pervious - Runoff from impervious flows to pervious area.

• Outlet - Runoff from both areas flows directly to outlet.

SubareaPercent Routed

Specify the percentage of runoff routed between subareas.