22.44.2160-22.44.2180

Other

• Factor of safety (seismic)1.1 ratio

  The analyses shall demonstrate a factor of safety greater than or equal to 1.5 for the static condition and greater than or equal to 1.1 for the seismic condition.

• Factor of safety (static)1.5 ratio

  If the bluff exhibits a factor of safety of less than 1.5 for either gross or surficial landsliding, then the location on the bluff top at which a 1.5 factor of safety exists shall be determined.

• 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.

• Minimum ancillary structure bluff setbackSetbackThe distance a building must be held back from a lot line.15 ft

  Ancillary structures such as decks, patios and walkways that do not require structural foundations may extend into the setback area but in no case shall be sited closer than 15 feet from the bluff edge.

• Minimum bluff retreat study period50 years

  the time span used to calculate a site-specific long-term bluff retreat rate shall be as long as possible, but in no case less than 50 years.

• Minimum bluff setbackSetbackThe distance a building must be held back from a lot line.100 ft

  In no case shall development be set back less than 100 feet.

• Reduced bluff setbackSetbackThe distance a building must be held back from a lot line.50 ft

  This distance may be reduced to 50 feet if the County geotechnical staff determines that either of the conditions below can be met with a lesser setback.

• Minimum erosion buffer10 ft

  development shall be set back a minimum distance equal to the distance that the bluff might reasonably be expected to erode over 100 years plus a 10 foot buffer

• Permanent structures on bluff face

  No permanent structures shall be permitted on a bluff face, except for engineered stairways or accessways to provide public beach access where no feasible alternative means of public access exists.

• 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