Autodesk CIVIL3D - CIVILDESIGNCOMP 2007 SLM CD Tutorials Manual page 115

6 Press Enter to end the waterdrop command.
Notice that most waterdrop paths in this area drain to the culverts that
are indicated by the red arrows. Next, you will use the water drop paths
you just created to define a catchment area that influences the culverts.
Create catchment areas
1 Click Analyze tab
2 In the Water Drop dialog box, specify the following parameters:
Catchment Layer: C-TOPO-CATCH
Catchment Object Type: 2D Polyline
Catchment Marker: Yes
Catchment Marker Style: Catchment Area
3 Click OK.
4 In the drawing, click the
Blue polygons that define each catchment region are created. The area
value of each catchment region is displayed on the command line. In
the drawing, each catchment point is indicated by a
NOTE If you receive a message indicating that the specified location results
in a catchment area with no area, it means that there is no flat area or high
spot on the specified point.
5 Press Enter to end the catchment area command.
Ground Data panel
marker for each waterdrop path.
Exercise 5: Analyzing Surface Water Runoff | 103
Catchment Area .
marker.