Reshape Subbasins Command

The Reshape Subbasins command of GeoHECHMS software allows the user to easily and quickly cleanup the watershed boundary for a single subbasin or between two adjacent subbasins.

This article describes how to use the Reshape Subbasins command.

Reshaping a Single Subbasin

Follow the steps below to reshape a single subbasin:

From the Watershed ribbon menu, select the Reshape Subbasins command.
The Reshape Subbasins dialog box will be displayed.
From the Single Subbasin panel, click the [Pick] button under the Select Subbasin to Reshape section. The Reshape Subbasins dialog box will temporarily disappear, and a prompt will be displayed on the status bar directing the user to select the subbasin to be reshaped.
Select the subbasin on the Map View to be reshaped.
The Reshape Subbasins dialog box will be redisplayed. The status of the Pick subbasin read-only field will change to Selected.

Draw Intersecting Reshape Polyline

This option allows the user to draw a polyline on the Map View that the reshaped subbasin should follow. The drawn polyline must intersect the subbasin two or more times. If both polyline endpoints are inside the subbasin, the intersecting area is added to the subbasin. If both polyline endpoints are outside the subbasin, the intersecting area is removed from the subbasin.

Choose the Draw Intersecting Reshape Polyline radio button option and click the [Draw] button. Note that the Draw Intersecting Reshape Polyline radio button option is selected by default.
The Reshape Subbasins dialog box will temporarily disappear, and a prompt will be displayed on the status bar directing the user to draw a trace polyline.
Draw the reshape polyline on the Map View representing the change in shape for the selected subbasin. Then, press the [Enter] key or right-click and select Done from the displayed context menu.
The Reshape Subbasins dialog box will be redisplayed. The status of the Draw reshape polyline read-only field will change to Drawn.
Click the [OK] button.
The software will reshape the selected subbasin.

Use Intersecting Trace Polyline

This option allows the user to select an already existing polyline on the Map View that the reshaped subbasin should follow. The selected polyline must intersect the subbasin two or more times. If both polyline endpoints are inside the subbasin, the intersecting area is added to the subbasin. If both polyline endpoints are outside the subbasin, the intersecting area is removed from the subbasin.

Choose the Use Intersecting Trace Polyline radio button option and click the [Pick] button.
The Reshape Subbasins dialog box will temporarily disappear, and a prompt will be displayed on the status bar directing the user to select the trace polyline that intersects with the subbasin to be reshaped.
Select the trace polyline on the Map View.
The Reshape Subbasins dialog box will be redisplayed. The status of the Pick trace polyline read-only field will change to Selected.
Click the [OK] button.
The software will reshape the selected subbasin.

Reshaping Adjacent Subbasins

Follow the steps below to reshape the subbasin boundary between two adjacent subbasins:

From the Reshape Subbasins dialog box, select the Adjacent Subbasins panel.
From the Select Adjacent Subbasins to Reshape section, click the [Pick]. The Reshape Subbasins dialog box will temporarily disappear, and a prompt will be displayed on the status bar directing the user to select two adjacent subbasins with a common boundary to be reshaped.
Select two adjacent subbasins on the Map View to be reshaped.
The Reshape Subbasins dialog box will be redisplayed. The status of the Pick two adjacent subbasins read-only field will change to Selected.

Note that the Draw Intersecting Reshape Polyline and Use Intersecting Trace Polyline options work similar to what is provided in the Single Subbasin panel. These options allow the user to either draw or select an already existing intersection trace polyline from the Map View.

After clicking the [OK] button, the software will reshape the common boundary of two adjacent subbasins along the intersecting trace polyline.