BasinFlow: Culvert Structure
Input Parameters:
name anything can go in here
in riser option for flow into a riser structure
out option for flow out of a riser
dam option for flow directly through a dam
D diameter, or horizontal dimension of box section, in feet
h height of box section, if applicable, in feet
S slope of the pipe
n manning's friction coefficient
eq equation constant set:
0 RCP, square edge with headwall
1 RCP, groove end with headwall
2 RCP, groove end projecting
3 CMP, with headwall
4 CMP, mitered to slope
5 CMP, projecting
6 Box, 30-75 degree wingwalls
7 Box, 90, 15 degree wingwalls
8 Box, 0 degree wingwalls
invert invert, or low point from which controlling head is computed      

The culvert computations follow FHWA HDS-5. Inlet control and a free flowing outlet are assumed. If a signficant tailwater is present, a performance curve should be generated separately and the generic Curve Structure used instead. Otherwise, it is often preferable to use the Orifice Structure, which yields very similar results, and is much easier.  This is especially true if the culvert is used as a riser outlet, which is typically designed so that it does not control the flow, and so is not actually active in the routing model.

This program uses the same computer code as the ChannelFlow program.  A more detailed description is contained in the ChannelFlow culvert help file.

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