Functional units (FUs) refer to areas of particular hydrological response. In Source, Functional Unit classes are initially defined in the Geographic Wizard (Specify functional units). This page explains how to manipulate FU areas outside the Geographic Wizard.
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- Manually using Edit » Functional Units » Assign Area Manually (Figure 1); or
- From a raster such as a land use map (Figure 2).
Areas can also be imported into the Functional Unit table from a .csv file.
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Note: Areal percentages per sub-catchment must sum to 100%. An error message is shown if Functional Unit areas do not add up to 100%:
Versions A 'Normalize Area Ratios' Button has been introduced in versions of Source after version 4.2.6. This button can be used to manage small errors resulting from decimal rounding. It will automatically fixed the sum of FU areas to equal the sub-catchment area. This is especially useful when areas are calculated from a shapefile or raster, where resolution differences between sub-catchments and FUs can result in small area differences.
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