RAS - Storage Area
RAS - Storage Area
(OP)
In HEC RAS, I am using a stage Hydrograph uptream as a boundary condition in a unsteady flow analysis.
I am wondering, if I want to perform a dambreak study of a dam located just downstream of this boundary condition, do I have to add a storage area upstream?
I am wondering, if I want to perform a dambreak study of a dam located just downstream of this boundary condition, do I have to add a storage area upstream?





RE: RAS - Storage Area
HEC-RAS only uses the upstream boundary condition for super-critical flow, if the upstream boundary is at a reservoir, super-critical flow won't occur, so it really doesn't matter what it is set as. In a sub-critical condition, the upstream boundary is defined by backwater.
RE: RAS - Storage Area
On my model, the cross-sections upstream of the dam don't represent the storage volume in the reservoir.
I though that I would define the volume of water released by the lake with the stage hydrograph?
I'm performing a unsteady flow analysis (need a upstream flow/stage hydrograph).