HY8:Roadway Data

When defining the roadway data for the culvert, the following parameters are required:

• Roadway Profile
• Roadway Station
• Crest Length
• Crest Elevation
• Roadway Surface
• Top Width

The roadway elevation can be either a constant or vary with station. An initial roadway station may be defined by the user or left at the default of 0.0. The stationing is used to position culverts along the length of the roadway profile when choosing the Front View option.

The roadway surface may be paved or gravel, or an overtopping discharge coefficient in the weir equation may be entered. The user may select a paved roadway surface or a gravel roadway surface from which the program uses a default weir coefficient value. If input discharge coefficient is selected, the user will enter a discharge coefficient between 2.5 and 3.095.

The values entered for the crest length and top width of the roadway have no effect on the hydraulic computations unless overtopping occurs.