22.44.2060-22.44.2102
Dimensional standards
Servicing
- Geographic extent
- Hazards Area - areas identified on Hazards Maps for geologic, flood, and fire hazards
Extracted standards
12 individual requirements pulled out of this section’s prose, each with the sentence it came from.
Floodplain
- Floodway use restrictions
The following uses are allowed in a floodway zone provided that the use does not otherwise violate federal, State, or local floodplain regulations: 1. Open recreation uses, such as public parks; 2. Other uses such that... 3. Bridges
- Maximum flood elevation increase1 ft
Said use does not constitute an unreasonable, unnecessary, undesirable or dangerous impediment to the flow of floodwaters, or cause a cumulative increase in the water surface elevation of the base flood of more than one foot at any point
- Minimum elevation above base flood (residential)1 ft
For residential structures in Zones A, AE, or AH on a FIRM, the lowest floor (including basement) shall be elevated at least one (1) foot above the base flood elevation
- Minimum elevation above base flood (mobile homesManufactured homeA dwelling built in a factory to a federal standard and transported to the site.)1 ft
For mobile or manufactures homes, the structure shall be elevated on a permanent foundation such that the lowest floor is at least one (1) foot above the base flood elevation
- Minimum elevation above depth number (Zone AO)1 ft
For structures in an area of shallow flooding (Zone AO on a FIRM), the lowest floor (including basement) shall be elevated at least one (1) foot above the depth number indicated on the most current FIRM
- Minimum elevation above grade (Zone AO, no depth number)3 ft
if there is no depth number on the most current FIRM, the structure shall be elevated at least three feet above the highest adjacent grade.
- Minimum flood vent area1 sqin/sqftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000.
will have at least two openings no more than one foot above grade with a total net area of at least one square inch per square foot of flooded area.
- Minimum flood vent openings2 openings
will have at least two openings no more than one foot above grade with a total net area of at least one square inch per square foot of flooded area.
Other
- Factor of safety (seismic)1.1 ratio
New development proposed on landslides, steep slopes, unstable or weak soils or any other identified geologic hazard area, shall be permitted only where a factor of safety of 1.5 (static) and a factor of safety of 1.1 (pseudostatic) can be provided.
- Factor of safety (static)1.5 ratio
New development proposed on landslides, steep slopes, unstable or weak soils or any other identified geologic hazard area, shall be permitted only where a factor of safety of 1.5 (static) and a factor of safety of 1.1 (pseudostatic) can be provided.
- Maximum permanent displacement50 mm
Seismic analyses may be performed by the pseudostatic method, but in any case shall demonstrate a permanent displacement of less than 50 mm.
- Horizontal seismic coefficient0.15 g
The effects of earthquakes on slope stability (seismic stability) may be addressed through pseudostatic slope analyses assuming a horizontal seismic coefficient of 0.15g
From the ordinance
Any development proposed in areas similar to the hazards mentioned in subsection A above and which are identified on a site during the development process shall comply with the provisions of the Hazards Area.