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Chapter 5 Working with Hydrology Commands
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Combining Hydrographs
You can combine one or more hydrographs together to form a composite
hydrograph which represents the combined rates of flow and volume. After
performing runoff calculations with the TR-20 Method or the TR-55 Tabular
Hydrograph Method, and saving the data to a hydrograph (.hdc file), you can
use the Combine Hydrographs command to combine multiple hydrographs
together.
To combine hydrographs
1 Generate hydrographs that you want to combine and save them as hdc files.
These hydrographs can be determined from the TR-20 Method, TR-55 Method,
or they can be hydrographs calculated from reservoir routing.
2 From the Hydrology menu, choose Runoff ä Combine Hydrographs to display
the Combine Hydrographs dialog box.
3 Click Add to load an existing hydrograph file to display the Add Hydrograph
File dialog box.
4 Select the hydrograph file that you want to add. Continue adding hydrograph
files by clicking Add and selecting the files. To remove a file from the list, select
the file name, then click Delete.
The names of the hydrograph files that you added are display in the
Hydrograph Files column of the Combine Hydrographs dialog box.
The offset times to combine display in the Offset Time column. By default,
these values are 0.