In all areas of special flood hazard, the following provisions are required for all new construction and substantial improvements:
(1) 
All new construction or substantial improvements shall be designed (or modified) and adequately anchored to prevent flotation, collapse or lateral movement of the structure resulting from hydrodynamic and hydrostatic loads, including the effects of buoyancy;
(2) 
All new construction or substantial improvements shall be constructed by methods and practices that minimize flood damage;
(3) 
All new construction or substantial improvements shall be constructed with materials resistant to flood damage;
(4) 
All new construction or 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;
(5) 
All new and replacement water supply systems shall be designed to minimize or eliminate infiltration of floodwaters into the systems;
(6) 
New and replacement sanitary sewage systems shall be designed to minimize or eliminate infiltration of floodwaters into the systems and discharge from the systems into floodwaters; and
(7) 
On-site waste disposal systems shall be located to avoid impairment to them or contamination from them during flooding.
(1971 Code, sec. 7 1/2-39)
In all areas of special flood hazard where base flood elevation data has been provided as set forth in section 3.12.007, section 3.12.032(8), or subsection (3) of this section, the following provisions are required:
(1) 
Residential construction.
New construction and substantial improvement of any residential structure shall have the lowest floor (including basement), elevated one (1) foot above the base flood elevation. A registered professional engineer, architect, or land surveyor shall submit a certification to the Floodplain Administrator that the standard of this subsection, as proposed in section 3.12.033(a)(1), is satisfied.
(2) 
Nonresidential construction.
New construction and substantial improvements of any commercial, industrial or other nonresidential structure shall either have the lowest floor (including basement) elevated to or above the base flood level or, together with attendant utility and sanitary facilities, be designed so that below the base flood level the structure is watertight with walls substantially impermeable to the passage of water and with structural components having the capability of resisting hydrostatic and hydrodynamic loads and effects of buoyancy. A registered professional engineer or architect shall develop and/or review structural design, specifications, and plans for the construction, and shall certify that the design and methods of construction are in accordance with accepted standards of practice as outlined in this subsection. A record of such certification which includes the specific elevation (in relation to mean sea level) to which such structures are floodproofed shall be maintained by the Floodplain Administrator.
(3) 
Enclosures.
New construction and substantial improvements, with fully enclosed areas below the lowest floor that are usable solely for parking of vehicles, building access or storage in an area other than a basement 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 either be certified by a registered professional engineer or architect or meet or exceed the following minimum criteria:
(A) 
A minimum of two (2) openings having a total net area of not less than one (1) square inch for every square foot of enclosed area subject to flooding shall be provided.
(B) 
The bottom of all openings shall be no higher than one (1) foot above grade.
(C) 
Openings may be equipped with screens, louvers, valves, or other coverings or devices provided that they permit the automatic entry and exit of floodwaters.
(1971 Code, sec. 7 1/2-40)
Located within the areas of special flood hazard established in section 3.12.007 are areas designated as shallow flooding. These areas have special flood hazards associated with base flood depths of one (1) to three (3) feet where a clearly defined channel does not exist and where the path of flooding is unpredictable and where velocity flow may be evident. Such flooding is characterized by ponding or sheet flow; therefore, the following provisions apply:
(1) 
All new construction and substantial improvements of residential structures shall have the lowest floor (including basement) elevated one (1) foot (minimum) above the base flood elevation highest adjacent grade, which shall be at least as high as the depth number specified in feet on the community’s FIRM (at least two (2) feet if no depth number is specified). A registered professional engineer, architect, or land surveyor shall submit a certification to the Town Engineer that the standard of this section is satisfied.
(2) 
All new construction and substantial improvements of nonresidential structures:
(A) 
Shall have the lowest floor (including basement) elevated at or above the highest adjacent grade, which shall be at least as high as the depth number specified in feet on the community’s FIRM (at least two (2) feet if no depth number is specified); or
(B) 
Shall together with attendant utility and sanitary facilities be designed so that below the base flood level the structure is watertight with walls substantially impermeable to the passage of water and with structural components having the capability of resisting hydrostatic and hydrodynamic loads of effects of buoyancy.
(3) 
A registered professional engineer or architect shall submit a certification to the Floodplain Administrator that the standards of this section, as proposed in section 3.12.033(a)(1), are satisfied.
(4) 
Require within zone AH or AO adequate drainage paths around structures on slopes, to guide floodwaters around and away from proposed structures.
(1971 Code, sec. 7 1/2-41)
Located within areas of special flood hazard established in section 3.12.007 are areas designated as floodways. Since the floodway is an extremely hazardous area due to the velocity of floodwaters, which carry debris, potential projectiles and erosion potential, the following provisions shall apply:
(1) 
Encroachments are prohibited, including fill, new construction, substantial improvements and other development, within the adopted regulatory floodway unless it has been demonstrated through hydrologic and hydraulic analyses performed in accordance with standard engineering practice that the proposed encroachment would not result in any increase in flood levels within the community during the occurrence of the base flood discharge.
(2) 
If subsection (1) above is satisfied, all new construction and substantial improvements shall also comply with all applicable flood hazard reduction provisions of this article.
(3) 
Under the provisions of 44 CFR, chapter 1, section 65.12, of the National Flood Insurance regulations, a community may permit encroachments within the adopted regulatory floodway that would result in an increase in base flood elevations, provided that the community first applies for a conditional FIRM and floodway revision through FEMA.
(1971 Code, sec. 7 1/2-42)