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Chapter 5 Working with Hydrology Commands
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Changing the Overtop Flow Values to Use in the
Culvert Calculations
You can include overtop flow values into the culvert calculations by using the
Over-Top button. A sag curve on the roadway surface is treated as a broad-
crested weir when overtopping is applied. You define the weir by defining a
mid-section length and one or two sections above that mid-section.
The following illustration shows the lengths of the weir:
Example of overtopping
To change the overtop flow values to use in the culvert calculations
1
In the Culvert Design dialog box, click Over-Top to display the Culvert Weir
Editor dialog box.
2
Select or clear the OverTopping check box:
n
To use the data from the Culvert Weir Editor dialog box in the culvert
calculation, select the OverTopping check box.
n
To keep the data but not use it in the current culvert calculation, clear the
OverTopping check box.