Sec. 18-399

New construction and substantial improvements shall be built according to this article and the VA USBC, and anchored to prevent flotation, collapse or lateral movement of the structure. (Sec. 18-399(a))

Provide a minimum of two (2) openings on different sides of each enclosed area subject to flooding. The total net area of all openings must be at least one (1) square inch for each square foot of enclosed area subject to flooding. (Sec. 18-400(c)(3))

Any structure or use of a structure or premises must be brought into conformity with these provisions when it is changed, repaired, or improved unless one of the exceptions is established. (Sec. 18-402)

The flood carrying capacity within an altered or relocated portion of any watercourse shall be maintained. (Sec. 18-399(j))

New construction and substantial improvements shall be constructed with materials and utility equipment resistant to flood damage. (Sec. 18-399(c))

Manufactured homes shall be anchored to prevent flotation, collapse, or lateral movement. (Sec. 18-399(b))

In zones A, AE, AH, and AO, all manufactured homes placed, or substantially improved, on individual lots or parcels, must meet all the requirements for new construction, including the elevation and anchoring requirements in section 18-399 and section 18-400. (Sec. 18-400(d)(1))

New construction or substantial improvements shall be constructed by methods and practices that minimize flood damage. (Sec. 18-399(d))

Non-residential buildings located in all A1-30, AE, and AH zones may be flood-proofed in lieu of being elevated provided that all areas of the building components below the elevation corresponding to one (1) foot above the BFE plus eighteen (18) inches are water tight... (Sec. 18-400(b)(2))

New construction or substantial improvement of any commercial, industrial, or non-residential building (or manufactured home) shall have the lowest floor, including basement, elevated to or above the base flood level plus eighteen (18) inches. (Sec. 18-400(b)(1))

All recreational vehicles placed on sites must either: be on the site for fewer than one hundred eighty (180) consecutive days, be fully licensed and ready for highway use... or meet all the requirements for manufactured homes. (Sec. 18-400(d)(2))

New construction or substantial improvement of any residential structure (including manufactured homes) in Zones A1-30, AE, AH and A with detailed base flood elevations shall have the lowest floor, including basement, elevated to or above the base flood level plus eighteen (18) inches. (Sec. 18-400(a))

New and replacement sanitary sewage systems shall be designed to minimize or eliminate infiltration of flood waters into the systems and discharges from the systems into flood waters. (Sec. 18-399(g))

Base flood elevation data shall be obtained from other sources or developed using detailed methodologies, hydraulic and hydrologic analysis, comparable to those contained in a Flood Insurance Study for subdivision proposals and other proposed development proposals (including manufactured home parks and subdivisions) that exceed fifty (50) lots or five (5) acres, whichever is the lesser. (Sec. 18-401(d))

All subdivision proposals shall be consistent with the need to minimize flood damage; shall have public utilities and facilities such as sewer, gas, electrical and water systems located and constructed to minimize flood damage; shall have adequate drainage provided to reduce exposure to flood hazards. (Sec. 18-401(a)-(c))

Electrical, heating, ventilation, plumbing, air conditioning equipment and other service facilities, including duct work, shall be designed and/or located so as to prevent water from entering or accumulating within the components during conditions of flooding. (Sec. 18-399(e))

Variances shall be issued only upon (i) a showing of good and sufficient cause, (ii) after the board of zoning appeals has determined that failure to grant the variance would result in exceptional hardship to the applicant, and (iii) after the board of zoning appeals has determined that the granting of such variance will not result in unacceptable or prohibited increases in flood heights, etc. (Sec. 18-403)

On-site waste disposal systems shall be located and constructed to avoid impairment to them or contamination from them during flooding. (Sec. 18-399(h))

New and replacement water supply systems shall be designed to minimize or eliminate infiltration of flood waters into the system. (Sec. 18-399(f))

Prior to any proposed alteration or relocation of any channels or of any watercourse, stream, etc., within this jurisdiction a permit shall be obtained from the U.S. Corps of Engineers, the Virginia Department of Environmental Quality, and the Virginia Marine Resources Commission. (Sec. 18-399(i))

All uses, activities, and development occurring within any floodplain district, including placement of manufactured homes, shall be undertaken only upon the issuance of a zoning permit. (Sec. 18-398(a))

The floodplain districts described above shall be overlays to the existing underlying districts as shown on the official zoning ordinance map, and as such, the provisions for the floodplain districts shall serve as a supplement to the underlying district provisions. (Sec. 18-397)