In all areas of special flood hazard, the following standards are required:
(1) 
Anchoring.
(a) 
All new construction and substantial improvements shall be anchored to prevent flotation, collapse or lateral movement of the structure resulting from hydrodynamic and hydrostatic loads, including the effects of buoyancy.
(b) 
All manufactured homes shall meet the anchoring standards of RDMC § 15.15.180.
(2) 
Construction Materials and Methods.
(a) 
All new construction and substantial improvements shall be constructed with materials and utility equipment resistant to flood damage.
(b) 
All new construction and substantial improvements shall be constructed using methods and practices that minimize flood damage.
(c) 
All new construction and substantial improvements shall be constructed with electrical, heating, ventilation, plumbing and air conditioning equipment and other service facilities that are designed and/or located so as to prevent water from entering or accumulating within the components during conditions of flooding.
(3) 
Elevation and Floodproofing.
(a) 
New construction and substantial improvements of any structure shall have the lowest floor, including basement, elevated to one foot above the base flood elevation. Nonresidential structures may meet the standards in subsection (3)(b) of this section upon the completion of the structure. The elevation of the lowest floor including basement shall be certified by a registered professional engineer or surveyor and verified by the community building inspector to be properly elevated. Such certification and verification shall be provided to the Floodplain Administrator.
(b) 
Nonresidential construction, new or substantial improvement, shall either be elevated in conformance with subsection (3)(a) of this section or together with attendant utility and sanitary facilities:
(i) 
Be floodproofed so that below the base flood level the structure is watertight with walls substantially impermeable to the passage of water;
(ii) 
Have structural components capable of resisting hydrostatic and hydrodynamic loads and effects of buoyancy; and
(iii) 
Be certified by a registered professional engineer or architect that the standards of this subsection are satisfied. Such certifications shall be provided to the Floodplain Administrator.
(c) 
Require, for all new construction and substantial improvements, that fully enclosed areas below the lowest floor that are usable solely for parking of vehicles, building access or storage and which are subject to flooding shall be designed to automatically equalize hydrostatic flood forces on exterior walls by allowing for the entry and exit of floodwaters. Designs for meeting this requirement must exceed the following minimum criteria:
(i) 
Have a minimum of two openings having a total net area of not less than one square inch for every square foot of enclosed area subject to flooding. The bottom of all openings shall be no higher than one foot above grade. Openings may be equipped with screens, louvers, valves or other coverings or devices; provided, that they permit the automatic entry and exit of floodwaters; or
(ii) 
Be certified by a registered professional engineer or architect to comply with the guidelines for engineered openings in FEMA Technical Bulletin 1-93.
(d) 
Manufactured homes shall also meet the standards in RDMC § 15.15.180.
(Ord. 235 § 5.1, 1999; Ord. 366 § 1, 2018)
(1) 
All new and replacement water supply and sanitary sewage systems shall be designed to minimize or eliminate infiltration of flood waters into the system and discharge from systems into flood waters.
(2) 
On-site waste disposal systems shall be located to avoid impairment to them or contamination from them during flooding.
(Ord. 235 § 5.2, 1999)
(1) 
All preliminary subdivision proposals shall identify the special flood hazard area and the elevation of the base flood.
(2) 
All final subdivision plans will provide the elevation of proposed structure(s) and pads. If the site is filled above the base flood, the final pad elevation shall be certified by a registered professional engineer or surveyor and provided to the Floodplain Administrator.
(3) 
All subdivision proposals shall be consistent with the need to minimize flood damage.
(4) 
All subdivision proposals shall have public utilities and facilities such as sewer, gas, electrical and water systems located and constructed to minimize flood damage.
(5) 
All subdivisions shall provide adequate drainage to reduce exposure to flood hazards.
(Ord. 235 § 5.3, 1999)
All new and replacement manufactured homes and additions to manufactured homes shall:
(1) 
Be elevated so that the lowest floor is one foot above the base flood elevation; and
(2) 
Be securely anchored to a permanent foundation system to resist flotation, collapse or lateral movement.
(Ord. 235 § 5.4, 1999; Ord. 366 § 1, 2018)
(1) 
All recreational vehicles placed on sites within Zones A1 through A30, AH, and AE on the community's flood insurance rate map will either:
(a) 
Be on the site for fewer than 180 consecutive days, and be fully licensed and ready for highway use. A recreational vehicle is ready for highway use if it is on its wheels or jacking system, is attached to the site only by quick disconnect type utilities and security devices, and has no permanently attached additions; or
(b) 
Meet the permit requirements of Article III of this chapter and the elevation and anchoring requirements for manufactured homes in RDMC § 15.15.180(1).
(2) 
Recreational vehicles placed on sites within Zones V1 through V30, V, and VE on the community's flood insurance rate map will meet the requirements of subsection (1) of this section and RDMC § 15.15.200.
(Ord. 235 § 5.5, 1999)
Located within areas of special flood hazard established in RDMC § 15.15.070 are areas designated as floodways. Since the floodway is an extremely hazardous area due to the velocity of flood waters which carry debris, potential projectiles, and erosion potential, the following provisions apply:
(1) 
Prohibit encroachments, including fill, new construction, substantial improvements, and other development unless certification by a registered professional engineer or architect is provided demonstrating that encroachments shall not result in any increase in flood levels during the occurrence of the base flood discharge.
(2) 
If subsection (1) of this section is satisfied, all new construction and substantial improvements and other proposed development shall comply with all other applicable flood hazard reduction provisions of this article.
(Ord. 235 § 5.6, 1999)