The Texas Commission on Environmental Quality (TCEQ) Dam Safety Program document GI-364 "Hydrologic and Hydraulic Guidelines for Dams in Texas" 8.3 Breach Parameters / Breach Configuration (Embankments) requires a breach width minimum of 3 times the height of water being impounded and vertical side walls. HydroCAD does not allow for vertical sidewalls for the DAM Breach outlet. The minimum notch angle (NAngle) is 20 degrees. I am trying to come up with the best model I can to have the equivalent flow going through the breach outlet. Higher peak flows are acceptable, but that impacts the spillway design and the downstream inundation area, especially the box culverts under a roadway just downstream from the dam. Can I override the NAngle parameter?
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