6.3.2 Hydrologic Object Layers

Hydrologic object layers are the geospatial representation of hydrologic objects. Each type of hydrologic object has one corresponding layer as shown in the figure below. These layers have the same name of hydrologic objects and are grouped in the same way as they are grouped in the toolbox. The geometry type (polygon, polyline or point) of each layer is given in Table 7-1.

TABLE 7-1 THE GEOMETRY TYPE OF HYDROLOGIC OBJECT LAYERS

Category	Hydrologic object & Geometry Type	Category	Hydrologic object & Geometry Type
Hydrograph	Polygon Polygon Polygon Polygon	Operation	Point Point Point Point
Route	Polyline Polyline Polyline Polyline Point	Utility	Point Point
LID	Point Point Point Point	LID	Point Point Point Point