From and after the date of the adoption of this subchapter, all retaining walls constructed upon property abutting upon waterways and bodies of water within the city shall be constructed to meet the following criteria:
(A) Developed areas. In previously developed areas, the retaining walls shall be of uniform height, and in order to insure proper security and safety to the public, all retaining walls shall be constructed of permanent rot and rust resistant material such as concrete, coral rock, cement, asbestos or corrosion resisting steel. New materials and methods may be used, provided that they admit to rational analysis and are approved by the city. Reasonable conformity to existing alignment and grade will be required, as determined by the city.
(B) Undeveloped areas. In previously undeveloped areas, the elevation at the established bulkhead line shall be set at +2.0 feet mean sea level, U.S. Coast and Geodetic Survey datum. This will be the bulkhead cap elevation if a bulkhead is installed at this location. If there is not to be a bulkhead constructed at the established bulkhead line, the elevation shall still be maintained at +2.0 feet mean sea level.
(1) Canals. A maximum slope of one-foot vertical shall be provided for each four feet horizontal from the bulkhead line into a minimum elevation of -2.0 feet mean sea level, U.S.C. and G.S. datum (or a minimum of 16 feet horizontal). Below elevation of -2.0 feet mean sea level, a maximum slope of one-foot vertical for each two feet horizontal shall be maintained until a minimum elevation of -12.0 feet mean sea level is established.
(2) Bodies of water not considered canals. A maximum slope of one foot vertical shall be provided for each four feet horizontal from the bulkhead line into a minimum depth of five feet of water at low water elevation. A maximum slope of two feet horizontal to one foot vertical shall be maintained to a minimum elevation of -10.0 feet, mean sea level.
(3) A maximum slope of one foot vertical for each two feet horizontal will be required on the bank side of the bulkhead line until the established building pad elevation has been reached. (Sketches are on file and available for inspection in the office of the City Clerk.
(4) No sealed rip-rap, slope paving or materials of this type will be permitted below the bulkhead line. This area shall be left in a free and natural state compatible with marine life. Above the bulkhead line, slope paving or other means of construction may be used to provide erosion control along the bank as approved by the city.
('72 Code, § 11-32) (Ord. O-72-200, passed 11-28-72; Am. Ord. O-95-31, passed 6-7-95)