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Assigning HEC-HMS Storage Areas

In GeoHECHMS, the Assign Storage Areas command allows the user to manually associate previously drawn polylines or polygons as storage areas.

Follow the steps below to use the Assign Storage Areas command:

  1. From the Input ribbon menu, select the Storage Areas dropdown menu and then choose the Assign Storage Areas command.
  2. The Assign Storage Areas dialog box will be displayed.

The following sections describe how to use the Assign Storage Areas command and interact with the above dialog box.

Selecting Storage Areas Polygons/Polylines

Selection of a naming method from the Storage Area Specifications section should be considered before selecting storage area polygons/polylines. If the Storage area ID radio button option is selected, then only one polygon can be selected and assigned as a storage area at a time. By contrast, if the Auto-name storage area ID radio button option is selected, the user can interactively and continuously select polygons/polylines on the Map View to assign them as storage areas without having to purposefully interact with the dialog box.

Assigning Individual Storage Areas

To assign storage areas one at a time, naming each individual storage area before assigning the next one, follow the steps below:

  1. From the Storage Area Specifications section, select the Storage area ID radio button option.
  2. Click the [Pick] button, and the dialog box will temporarily disappear.
  3. The status bar will prompt you to select the polygon/polyline on the Map View. Select the storage area polygon/polyline on the Map View.
  4. After selecting the polygon/polyline, the user is immediately returned to the Assign Storage Areas dialog box. The Storage area polygons/polylines read-only field will be changed from Not Selected to Selected.
  5. Enter the unique name to identify the selected storage area polygon/polyline in the Storage area ID entry field. After entering the name, press the [Enter] key or click the [Apply] button.
  6. Continue this process of assigning one storage area at a time until all the storage areas have been defined on the Map View. When finished, click the [Close] button to close the dialog box.

Assigning Multiple Storage Areas

To assigns multiple storage areas continuously without having to purposefully interact with the dialog box to identify and name each storage areas polygon/polyline, follow the steps below:

  1. From the Storage Area Specifications section, select the Auto-name storage area ID radio button option.
    The different storage area naming formats present in the Auto-name storage area ID option are as follows:

    • Storage area ID prefix: This option allows a prefix to be added to the front of the storage area ID.
    • Storage area ID digits: This option permits specification of a set number of digits to use for the storage area ID. For example, using 3 digits causes the storage areas ID to be of the format 001, 002, etc.
    • Next available storage area ID: This entry defines the next element ID number to be used.
    • Storage area ID increment: This entry defines the increment to use when numbering elements. The default value is 1.
    • Storage area ID suffix: This option allows a suffix to be added to the end of the storage area ID.
    • Storage area ID preview: This entry provides a preview of the storage area naming specifications defined above.
  2. Click the [Pick] button, and the dialog box will temporarily disappear.
  3. On the Map View, click on a previously drawn storage area polygon/polyline to select it. Continue this process of selecting one storage area polygon/polyline at a time until all the polygons/polylines on the Map View have been selected.
  4. When finished, right-click and choose Done from the displayed context menu or press the [Enter] key. The storage areas will be named and created automatically. You will be returned to the dialog box. Click the [Close] button to close the dialog box.

About the Author Chris Maeder

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