[jzhang]

I have a project, which has over 200 ac drainage area, the channel running across our site till it hits an highway with a 36" RCP pipe.

I figured I shall route the inflow first, so that the flow will be reduced at other side of the culvert, and use the water elevation as my starting elevation for hec-ras study.

Couple questions:

1. When I route the basin, the outflow changes with the tailwater elevation, looks like it is a trial and error process. I need to assume a tailwater elevation, route the basin, ajust the outflow, run the hec-ras model again, adjust tailwater for the routing, and back and forth several time, is this procedure the right way to do? and is there any better way to do it?

2. In the river CAD model I will build all the sections under the same project, and how can I specify different flow for different river sections?

Please help me!

Thank you!


John