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Precipitation Type – Rainfall Distribution

The Rainfall Distribution precipitation type of the Meteorology Data dialog box is a region-based temporal rainfall distribution of different areas. The data used in this precipitation type is created by historical storm events and the statistical analysis for each climate region and then grouped by different durations (6-hr, 12-hr, 24-hr, etc.), quartiles (1st, 2nd, 3rd, 4th), and percent of occurrence (10%, 20%, 30%, etc.). The characteristics curve of rainfall distribution is a relationship between fractional rainfall intensity and elapsed time. These storm distributions contain the cumulative fractional rainfall depth that ranges from 0 to 1 and the incremental fractional intensity rainfall distribution.

When Rainfall Distribution is selected for the Precipitation type in the Meteorology Data dialog box, the following data panel will be displayed for the Precipitation Data selector.
Rainfall Distribution precipitation panel

The following sections describe how to interact with the Rainfall Distribution data panel of the Meteorology Data dialog box.

Rainfall Distribution Specifications

This section of the data panel includes the following parameters.

  • Rainfall distribution
    This field displays information about the type of rainfall distribution selected. Clicking the [Select] button displays the Rainfall Distribution dialog box.
    Rainfall Distribution precipitation panel - Rainfall Distribution dialog boxThe above dialog box allows the user to select different available rainfall distributions. Refer to this article to learn more about the Rainfall Distribution dialog box.
  • Rainfall description
    This field displays the description corresponding to the selected rainfall distribution.
    Rainfall Distribution precipitation panel - Rainfall Distribution Specifications section
  • Storm duration
    This field displays the corresponding value of a storm duration (in hours) for the selected rainfall distribution.

Precipitation Assignment

This section of the data panel includes the following input parameters:
Rainfall Distribution precipitation panel - Precipitation Assignment panel

  • All subbasins same precipitation
    After selecting this radio button, the user can assign the same amount of precipitation to all the subbasins present within the model.
  • Individual subbasin precipitation
    After selecting this radio button, the user can specifically mention the amount of precipitation for all the individual subbasins present within the model.

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