Nothing herein provided shall be so construed as to prohibit the owners of lands within any area threatened by flood or tidal waters from lawfully filling, draining, constructing levies and bulkheads, or otherwise improving their land with clear fill so as to adequately protect improvements against the danger of flood or the erosion of soil so long as it is done in compliance with any Federal, State, County or local regulations governing tidal waters and drainage rights-of-way, and in accordance with Chapter 26 of these Revised Ordinances.