The Hyetograph Pattern editor is used to edit existing or create new hyetograph patterns. The hyetograph pattern is used to transform the computed depth-duration curves for each of the isohyets into the pattern desired for a hyetograph. HMR52 guidance defines a standard pattern which is used in HEC-MetVue by default. The plugin comes with the standard pattern, which arranges the twelve 6-hour values from the depth-duration curves as shown in the following figure.

The HMR52 standard pattern cannot be edited but new patterns can be added and edited.  For editable patterns, the buttons for moving ordinals are enabled, and one or more ordinals can be selected to change their position at the same time. An example of an edited pattern with a skewed right hyetograph is shown in the following figure. 

The following table provides a description of the features available in the Hyetograph Pattern editor.

Edit Hyetograph Pattern

Control Name

Value

Pattern name

This shows the currently selected pattern. All the available patterns are contained within the dropdown. The standard HMR52 pattern is always in the list.

New… button

Use this to create a new pattern to edit. It will bring up an input dialog to enter the name for the new pattern.

Delete button

Delete the active pattern. The standard HMR52 pattern cannot be deleted.

Ordinal table

This is the table that contains the twelve 6-hour ordinals that HMR52 defines.

Highlight the ordinals to move using the standard mouse selection options; 

  • Click to select an ordinal.
  • Shift-click for range of ordinals.
  • Control-click to add an ordinal to an existing selection.

Move to top

Moves the highlighted ordinals to the top of the list. The standard HMR52 pattern cannot be edited.

Move up

Moves the highlighted ordinals up one position.

Move down

Moves the highlighted ordinals down one position.

Move to bottom

Moves the highlighted ordinals to the bottom of the list.

Hyetograph sample

This shows a preview of what the hyetograph ordinal output would look like. The proportionality of the individual ordinals are approximate.