A free span bridge with abutments outside of the channel needs to be analyzed for scour with the assumption that lateral channel migration could expose the abutments to high velocity flows. I am using the HEC-RAS Hydraulic Design Function for this analysis. What is the best way to go about this...
FEMA requires 3 feet of freeboard for levees, but is their a freeboard requirement for culverts? A developer wants to build adjacent to a creek that goes underground through a culvert for 50 feet. If, for example, the hydraulic analysis shows the water surface elevation at the upstream end of...
I just learned that the National Flood Hazard Layer in Google Earth can be used for official floodplain determinations. Has anyone figured out how to produce a printout of the imagery displayed on GE in a manner that makes the printed version of the map just as authoritative... something similar...
