When submitting information for an AE zone. How and what would you submit for this requirement?
*BFE Explanation
Please upload a detailed explanation of how the BFE was determined. This should include a copy of the effective FIS Profile (for riverine flooding sources) annotated with the scaled location of the subject structure or property or a copy of the FIS Summary of Stillwater Elevations Table (for stillwater flooding sources) with an annotation indicating the BFE for the subject of the eLOMA.
In NC, there is a State website dedicated to flood data. From there, you can link to the FIS and download. I haven't done an eLOMA; however, I download the relevant data and keep as backup in my file for typical cert's.
You should find the profiles in the appendix. Locate your property and determine a distance up or downstream from the nearest flow obstruction (culvert, bridge, etc.). Then strike a vertical from your location to the flood profile. Next, a horizontal from that intersection to the y-axis and note your BFE.
Stillwater elevations are given by cross-section in the body of the FIS. Locate your stream's table in the FIS (generally a spreadsheet layout) and pull the cross section from the current FIRM (I think stillwaters are generally constant from xsect to xsect). Note BFE for your property from the Stillwater table.
I believe if neither of these exist for the subject parcel, you can use the number from the FIRM, itself. Whichever you choose: print, annotate, scan and archive.
If you are submitting for a river, you will need to submit a copy of the FIRM showing the building location, a line to where you think the BFE should be determined on the centerline, and a measurement from the nearest cross section down (or up) the centerline. Then an annotated copy of the FIS profile showing a vertical line at the distance from the referenced cross section and a horizontal line showing where the BFE intersects the vertical line indicating what that elevation is.
Hope that makes sense.
This is what I sent recently
Joe the Surveyor, post: 378568, member: 118 wrote: When submitting information for an AE zone. How and what would you submit for this requirement?
*BFE Explanation
Please upload a detailed explanation of how the BFE was determined. This should include a copy of the effective FIS Profile (for riverine flooding sources) annotated with the scaled location of the subject structure or property or a copy of the FIS Summary of Stillwater Elevations Table (for stillwater flooding sources) with an annotation indicating the BFE for the subject of the eLOMA.
This is a copy of a recent one I did
Paul D, post: 378587, member: 323 wrote: If you are submitting for a river, you will need to submit a copy of the FIRM showing the building location, a line to where you think the BFE should be determined on the centerline, and a measurement from the nearest cross section down (or up) the centerline. Then an annotated copy of the FIS profile showing a vertical line at the distance from the referenced cross section and a horizontal line showing where the BFE intersects the vertical line indicating what that elevation is.
Hope that makes sense.
Yup. I do something similar. I attach the FIS sheet with red lines on it and then I type a fast 'explanation' of how I measured the distance from the nearest cross section and yada yada. Takes 2 minutes.
Well here is the deal, this is on Long Island Sound, actually just inland of the shore, so its a AE 11 zone. But there are no FIS profiles of the sound that I can see.
Is it on the summary of stillwater elevations? If so, I print that page of the FIS and just highlight the appropriate flooding source and BFE.