As a follow up to the just-posted Critical Depth Primer, I want to share a trick for getting HEC-RAS to compute and display critical depth at every cross section for unsteady flow. As I mentioned in the previous post, if you are running a steady flow model, there is an option to have RAS compute […]
Critical depth is an important hydraulic parameter when evaluating hydraulic modeling results. As we know from our college hydraulics 101 class, water flowing at depths less than critical depth is supercritical and water flowing at depths greater than critical depth is subcritical. Supercritical flow is characterized by relatively shallow depths and high velocities. Subcritical flow […]
I just received this question about downstream boundaries in HEC-RAS, and thought it would make a nice post here on RASModel.com. “…regarding the boundary condition, if I use critical depth instead of normal depth will it be unacceptable? When choosing the normal depth I need to enter a slope, can i use just one slope […]