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If the dye computational option is selected as shown in Figure 1 2387596 then the user may assign a "decay" rate to the otherwise conservative tracer.

The "dye" constituent may also be used as an "age of water" function to compute residence times and visualize domain/boundary water mixing if this option is selected. This option is available in EFDC_DSI EFDCPlus only.

See Apply Cell Properties via Polygons as to how to apply cell properties via polygons with the Dye button in the Initial Conditions frame.

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Figure 1
Figure 1

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Figure 1 1. Dye/Age Tab

The "decay" rate options are shown in Table 1 2387596.

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Table 1
Table 1
Table 1 1. Dye "decay" rate options.

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If using the restart option, the user can initialize a dye field using the DYE.INP file by selecting the Dye Overwrite check box on the Initial tab, located in the EFDC Restart Option frame.