Modeling a Culvert with 2 different slopes
Modeling a Culvert with 2 different slopes
(OP)
Hi,
I am wondering what is the best way to model this situation:
I have a roadside ditch which discharges into a culvert. Midway along the culvert, the slope changes from 0.5% to 1.5%. The culvert then discharges to another ditch. Should I model the culvert as two separate culverts in series?
I am wondering what is the best way to model this situation:
I have a roadside ditch which discharges into a culvert. Midway along the culvert, the slope changes from 0.5% to 1.5%. The culvert then discharges to another ditch. Should I model the culvert as two separate culverts in series?





RE: Modeling a Culvert with 2 different slopes
If the pipe is sealed at the slope transition, you could use the average slope. This will retain the correct invert elevations at the inlet and outlet.
Putting two culvert outlets in series (on the same pond) will depend on the flow regime within the culverts. Just remember that this solution will evaluate the pipes separately and then use the lesser flow at each headwater elevation.
You should probably try a couple of alternatives and compare the results.
Peter Smart
HydroCAD Software
www.hydrocad.net
RE: Modeling a Culvert with 2 different slopes
Thanks for getting back to me so quickly. There is no junction between the culverts. I'll try your suggestions and see how they compare.
Thanks again.
RE: Modeling a Culvert with 2 different slopes
RE: Modeling a Culvert with 2 different slopes
You can enter the Ke value directly without selecting the entrance geometry - but this really depends which approach you're talking about.
Peter Smart
HydroCAD Software
www.hydrocad.net
RE: Modeling a Culvert with 2 different slopes
RE: Modeling a Culvert with 2 different slopes
Peter Smart
HydroCAD Software
www.hydrocad.net