First you need to know what type of land is below that water. Is it historically dry land that was dredged to create an “artificial” waterway, or was that waterway navigable at the time Florida was made a state? If so, then the land below the water is owned by the State of Florida (a/k/a Sovereign Submerged Lands) and the waterway is a “natural waterway”. A property in the latter location is said to enjor Riparian Rights.
The Rules governing the repair or replacement of a seawall and/or riprap adjacent to artificial waters are:
Rule 62-330.051(12)(a), F.A.C.
Section 403.813(1)(i), F.S.
The Rules governing the repair or replacement of a seawall and/or riprap adjacent to natural waters are:
Rule 62-330.051(12)(b), F.A.C.
Section 403.813(1)(e), F.S.
If one is filling a “gap” between, and adjoining, existing walls/riprap then aplpicable rules are in:
62-330.051(12)(c), F.A.C.
Section 403.813(1)(i), F.S.
And for those using the excemption for a “Living Shoreline” then the rules for this are found in:
Rule 62-330.051(12)(e), F.A.C.