Sec. 23-7.2.11, 23-7.2.12
Uses
Accessory1
- Docks, boat houses (not for human habitation), and other water-dependent accessory structures on pilings
Prohibited3
- Septic drainfields within the floodplain
- Accessory structures within the floodplain (except water-dependent structures)
- Manufactured homes in the Floodway District (except in existing parks/subdivisions)
Extracted standards
8 individual requirements pulled out of this section’s prose, each with the sentence it came from.
Floodplain
- Maximum increase in base flood elevation1 ft
Development activities in Zones A1-30, AE, or AH on the County's FIRM which increase the water surface elevation of the base flood by more than one (1) foot may be allowed, provided that the applicant first applies - with the County's endorsement - for a Conditional Letter of Map Revision (CLOMR), and receives FEMA approval.
- Maximum heightMaximum heightThe tallest a building may be, given in feet, in storeys, or both — whichever binds first. of flood vent bottom above grade1 ft
The bottom of all required openings shall be no higher than one (1) foot above the adjacent grade.
- Substantial improvement threshold50 pct
The change, when added to all the changes made during a rolling 5-year period does not constitute 50% or more of the structure's value.
- Minimum flood vent opening area1 sqin/sqftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000.
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.
- Lowest floor elevation in AO Zone2 ft
If no flood depth number is specified, the lowest floor, including basement, shall be elevated no less than two (2) feet above the highest adjacent grade.
- Lowest floor elevation above base flood level1.5 ft
New construction or substantial improvement of any principal 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.
- Lowest horizontal structural member elevation in V/VE Zone1.5 ft
The bottom of the lowest horizontal structural member of the lowest floor (excluding the pilings or columns) is elevated to or above the base flood level plus eighteen (18) inches if the lowest horizontal structural member is parallel to the direction of wave approach or elevated at least two (2) feet above the base flood level if the lowest horizontal structural member is perpendicular to the direction of wave approach.
- Piling top elevation above base flood elevation1.5 ft
Permit plans must demonstrate the top of all installed pilings will be at least eighteen (18) inches above the base flood elevation.
From the ordinance
Accessory structures of any size shall be prohibited within the floodplain, except as set forth below... Septic drainfields shall be prohibited within the floodplain.