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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...

We do have stricter requirements for buildings in the floodplain (BFE +2') but we will be asking the developer to process a LOMR if the culvert can contain the 100-year flow. This will remove the proposed building from the floodplain, so our ordinance will no longer apply. We do not have any...

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...

Robert, That is what I had thought, too. But several years ago FEMA gave their blessing to locally produced GIS maps using FEMA produced flood hazard layers. That is why I was asking the original question: How do you locally produce a map that has the same credibility and legal standing as a...

E.G. slope includes velocity head. So E.G. slope will vary as velocity changes. Besides, do you really need the EGL? For most purposes, water surface elevation is all you need.

Drew08... Rather than deal with Google Earth use agreements, I went ahead and created the same map with the free MapWindow GIS program. It wasn't as hard as I thought and not only provides a better product, but I discovered that the NFHL layer in GE doesn't map all of the Zone X areas in our...

Drew08... you bring up an interesting point. The City of Morro Bay owns the rights to the imagery that Google Earth uses for our city (Morro Bay contracted for the air photo and Google purchased that same imagery from the same supplier... I'm sure it cost us much more than it cost Google!). The...

I think the cut and paste idea looks pretty good. To get the screen shot at the right scale, I added a 1000' line to the top of the map in GE, took the screenshot, pasted it into MS Publisher, adjusted the image size so that the line is scaled correctly, then cropped out the line. I have...

Good idea about doing it outside of GE. That is probably the best was to go, since the GIS program would allow you to set a scale, layout template, etc. I'm not real handy with GIS, though, which is why I was hoping someone had figured out a way to do it with GE.

I suppose you could recreate the pathnames that it is looking for on your computer. Pain in the neck, though.

It is easier to fix it on the other end. Have the consultant do a "Save As" of the project files to a location on his "C" drive and then send you the files. The files references will all be logically stored under that new location. That way you can recreate that same location easily on you...

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...