Sub-Catchment drawing tool

Sub-Catchment drawing tool

This tool, , is used to draw sub-catchments in the Main Window. Since it is wrong to place a sub-catchment directly over a pit, the pit will snap to the top, right hand side of the pit.  It can then be moved to other sides of the pit, if desired.

Sub-Catchment symbols must be placed near a node, pit or detention basin. When these are connected at a bridge or culvert the catchmentis assumed to flow to the upstream side.

You can enter several sub-catchments without having to refer back to the Toolbar or Draw menu by holding down the shift key as you click. If you enter a catchment by mistake, hold the mouse pointer on it, press the right mouse button to open a small menu. From this, select Delete to remove the sub-catchment.  Alternatively, you can select the sub-catchment with the pointer, so that 'handles' appear around it. Pressing the Delete key on you keyboard will remove the sub-catchment.

You should then right-click your mouse pointer on the sub-catchment symbol to bring up a menu from which you can select Edit Data to open the Sub-Catchment property sheet and enter data.