I am analysing a culvert in a tidal zone which has an outlet invert level below the normal tidal range. The invert level of the culvert outler is -0.520m, however Hydraflow Express Culverts will not allow a negative invert elevation to be entered.
Thank you very much for your reply. I will try and model this culvert in SSA. Do you know if SSA will output similar results for a culvert as Hydraflow Express - i.e. HGL's, Hw Elevation, Hw/D, results schematic and wheter the culvert flow regime is inlet or outlet control.