Ms. Langley, as I am not typically informed of details of lending decisions once the report is delivered to the lender, I have very limited knowledge of the decisions made if the YES box is checked, obviously Mr. Ellis is far more qualified to discuss this.
The few times this has come up after the appraisal is delivered to the lender, typically the lender has supplied a flood certification, and in turn the appraiser is asked to revisit his/her report based on a flood certification the lender has supplied, as opposed to a less detailed FEMA map. (Obviously recommending the appraiser fully disclaim that any changes to the report are based entirely on that flood certification that was supplied by the client.)
I am aware of atleast one occasion where an appraiser had checked the NO box incorrectly, the appraiser was subsequently sued after the subject was flooded, and lost the lawsuit. (That report did NOT come through our company by the way).
Mr. Butler, as I worked as a land surveyor for over 15 years out in the field, having performed many flood certifications, your second description simply proves that "Skippy" is alive and well in every profession, even a science. Your first post doesn't have enough detail to determine whether or not the municipality in question was adequately surveyed or not. Typically in my experience "benchmarks" would be set at the 500 foot intervals you mention, however there would be multiple elevations determined in between as needed. Again, I have no direct knowledge of the size, complexity of the situation you described, or the requirements of your state in this regard, but there may be other details that you may not be aware of or did not post.
Mr. Ellis, I whole heartedly agree that verbal direction from Mr. Minnich or anyone else for that matter, on this or any other technical matter in the appraisal field would be useless in a court of law, or potentially in front of a state board. However,beyond the Fanniemae "Selling Guide" the printed forms, including the noted certifications that apply and are signed, publications by Mr. Harrison, etc., those of us in the middle, between the appraiser and the lender, have very little guidance on such matters. My interpretaion of the preceding is that if the appraiser, based on all information available to him/her determines that the subjects site falls within a FEMA zone designated beginning with either "A" or "V", then he/she is obligated to check the YES box.
TC if you happen to read ths post, please be kind if there are spelling/grammatical errors here, it is VERY late on a Saturday night.