re: How to read a flood elevation certificate and relate to the river?

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Base flood elevation: 16
Elevation reference mark: 16.75
Top of bottom floor: 19

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The Base Flood Elevation (BFE) is the 100-year flood water surface elevation. It is in feet above sea level.

The worst case prediction flooding depicted is not the same as the 100-yr flood event. It will be much worse.

The "Estimated Flood Depth in Feet" is the difference between the water surface elevation during the worst case prediction and the ground surface in that location.

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To be above that 15-20 foot flood, the top of bottom floor would need to be what?

And for the BFE, what is its flood depth measured the same way as on that worst-case map (distance above ground surface in that location)?