All development, including manmade changes to improved or unimproved real estate for which specific provisions are not specified in this chapter, shall:
(A) 
Be located and constructed to minimize flood damage;
(B) 
If development is proposed in a floodway, it shall not be authorized unless a floodway encroachment analysis demonstrates that the proposed development or land disturbing activity will not result in any increase to the level of the base flood;
(C) 
Be anchored to prevent flotation, collapse or lateral movement resulting from hydrostatic loads, including the effects of buoyancy, during conditions of the base flood;
(D) 
Be constructed of flood damage-resistant materials; and
(E) 
Have electric service and/or mechanical equipment two feet above the base flood elevation in A Zones and three feet in coastal high hazard areas, except that minimum electric service required to address life safety and electric code requirements is allowed below the base flood elevation.
(Ord. 5350 § 1, 2020)
Fences in floodways shall not block the passage of floodwaters and shall be designed to break away if debris is caught during a flood event.
(Ord. 5350 § 1, 2020)
Flood control structures shall be permitted only to protect existing development (including agricultural operations) where no other alternative is feasible or where such protection is needed for public safety. Such structures shall not adversely affect sand supply, increase erosion or cause flooding on adjacent properties or restrict stream flows below minimums necessary to maintain fish and wildlife habitats or be placed further than necessary from the development requiring protection. An appropriate hydrologic investigation shall be required as determined by the Floodplain Administrator.
(Ord. 5350 § 1, 2020)
Roads and watercourse crossings in floodways shall not cause any increase in the base flood, as demonstrated through a floodway encroachment analysis. For bridges serving as watercourse crossings, hydraulic calculations shall be submitted (based upon the 100-year storm) which indicate that there is no increase in the base flood elevation.
(Ord. 5350 § 1, 2020)
In addition to the requirements of the building codes, in coastal high hazard areas, decks and patios shall be located, designed, and constructed in compliance with the following:
(A) 
A deck that is structurally attached to a building or structure shall have the bottom of the lowest horizontal structural member located three feet above the base flood elevation and any supporting members that extend below the base flood elevation shall comply with the foundation requirements that apply to the building or structure, which shall be designed to accommodate any increased loads resulting from the attached deck.
(B) 
A deck or patio that is located below the base flood elevation shall be structurally independent from buildings and structures and their foundation systems, and shall be designed and constructed either to remain intact and in place during base flood conditions or to break apart into small pieces that will not cause structural damage to adjacent elevated buildings and structures.
(C) 
A deck or patio that has a vertical thickness of more than 12 inches or that is constructed with more than the minimum amount of fill that is necessary for site drainage shall not be approved unless an analysis demonstrates that no harmful diversion of floodwaters or wave run-up and wave reflection would increase damage to adjacent elevated buildings and structures.
(D) 
A deck or patio that has a vertical thickness of 12 inches or less and that is at natural grade or on fill material that is similar to and compatible with local soils and is the minimum amount necessary for site drainage may be approved without requiring analysis of the impact on diversion of floodwaters or wave run-up and wave reflection.
(Ord. 5350 § 1, 2020)
In coastal high hazard areas, other development activities may be permitted only if located outside the footprint of, and not structurally attached to, buildings and structures, and only if an analysis demonstrates no harmful diversion of floodwaters or wave run-up and wave reflection on adjacent elevated buildings and structure. These activities include but are not limited to:
(A) 
Bulkheads, seawalls, retaining walls, revetments, and similar erosion control structures;
(B) 
Solid fences and privacy walls, and fences prone to trapping debris, unless designed and constructed to fail under design flood conditions; and
(C) 
Mounded septic systems.
(Ord. 5350 § 1, 2020)
In coastal high hazard areas:
(A) 
Nonstructural fill with finished slopes that are steeper than one unit vertical to five units horizontal may be permitted only if an analysis demonstrates no harmful diversion of floodwaters or wave run-up and wave reflection on elevated adjacent buildings and structures.
(B) 
Sand dune construction and restoration of sand dunes under or around elevated buildings may be permitted without engineering analysis or certification of the diversion of floodwater or wave run-up and wave reflection if the scale and location of the dune work is consistent with local beach-dune morphology and the vertical clearance is maintained between the top of the sand dune and the lowest horizontal structural member of the building.
(Ord. 5350 § 1, 2020)