Use this tab to review the catchment style settings and to specify the catchment boundary display mode and flatten value. 
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Catchment Boundary Display Mode
 
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- Use Object Elevation: Uses the elevations assigned to the catchment boundary (either obtained from the polyline or from the surface). 
 
- Flatten To Elevation: Uses the Catchment Boundary Flatten Value (specified below). 
 
 
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Catchment Boundary Flatten Value
 
- Specifies a single elevation to apply to the catchment boundary when Flatten To Elevation is specified for the Catchment Boundary Flatten Value.