Hi All,
I am trying to analyse a side channel spillway using HEC-RAS and wondering if anyone can give me any advice?
I have my reach, cross sections and a storage – and i have tried to model the spillway as three lateral structures (with slightly different levels) which connect the storage to the reach.
What I wanted to do was use a steady-state analysis, set the water level in the lake in the initial conditions, then see what the resulting outflows are. We expect that at some stage the side channel will “Drown out” and the control will shift downstream.
My problem, is no water seems to be coming out of the storage despite the set level being higher than the crest of the lateral structures.
Any advice on if this workflow would or would not work would be most appreciated 🙂
Kind Regards
Lyndon