Thanks gbam, that worked! The peak flow through the box culvert now reasonably matches that of the cicular.
Unfortunately, now I am losing flow after the hydrograph returns to baseflow. Instead of passing 2.5 cfs as I have defined it, only 0.1 cfs makes it through. Any ideas?
I set the entrance loss coeff to 0.2 and the exit loss to 1. The coefficients are set the same for both the square and circular culverts.
My units are feet. Hec Ras won't allow for inches in this dialog.
Thanks for the response, Brian
In an unsteady model, I've modeled a 5.3'x5.3' (~28 sq ft flow area) concrete box culvert that conveys a maximum of 25 cfs of roughly 380 cfs at the peak of the 100-yr hydrograph. The remainder of the flow overtops a lateral structure upstream of the culvert, flows into a storage area that is...
