In some cases, a polygon-hydrologic object needs to be split into several smaller ones. For example, if part of NasHyd is developed and the imperviousness surpass 20%, users will have to:

  1. Select the polygon-hydrologic object first and select Cut from context menu. Notice the cursor change to a pencil.
  2. Setup the snapping environment if necessary, to snap to desired points.
  3. Draw the polyline that will be the boundary between new hydrologic objects and double click to finish the sketch. If the polygon can be cut into pieces, new hydrologic objects will be created.

If the polyline can’t cut the polygon into pieces, a warning window will appear.