Hello all, I am in the process of refining some of my models and I was wondering what is the most accurate way of modeling a typical culvert that diverts a stream under a road? For example, lets say I have Catchment A that flows into a stream. The stream then flows south for 100' to a large culvert. The culvert goes under the road for 50' and at this point, Catchment B flows into the stream. The stream then continues for another 100' before coming to an outfall. Personally, I would have Catchment A flow to a Junction (say J1), model the stream as a conduit for 100' from J1 to a new junction (J2) right before the Culvert. I would then model the Culvert as a new Conduit traveling for 50' from J2 to J3. Then I would add Catchment B and have it flow to J3. Finally, I would connect J3 with the outfall using another 100' long conduit modeled as the stream. However, I hesitate to do this, because I know that conduits are supposed to represent open channels and not pipes. And since the Culvert is in theory "piping" the stream under the road, it is not an open channel. I suppose you could also just do all that mumbo jumbo above within the travel time calculations of each catchment. In which case, there would be no need to model anything I mentioned above, besides the two catchments flowing to the same outfall. So to sum everything up, which is the better method of modeling such a scenario? Model the stream then culvert, then the stream again, or just include all that in the travel times of the individual catchments? Thanks. TimZ
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