As used in this
article, unless the context otherwise requires:
(1)Aspect means the cardinal direction the land surface faces,
characterized by north-facing slopes generally having heavier vegetation cover.
(2)Avalanche means a mass of snow or ice and other material which may
become incorporated therein as such mass moves rapidly down a mountain slope.
(3)Corrosive soil means soil which contains soluble salts which may
produce serious detrimental effects in concrete, metal, or other substances that are
in contact with such soil.
(4)Debris-fan floodplain means a floodplain which is located at the mouth
of a mountain valley tributary stream as such stream enters the valley floor.
(5)Dry wash channel and dry wash floodplain means a small watershed
with a very high percentage
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As used in this
article, unless the context otherwise requires:
(1) Aspect means the cardinal direction the land surface faces,
characterized by north-facing slopes generally having heavier vegetation cover.
(2) Avalanche means a mass of snow or ice and other material which may
become incorporated therein as such mass moves rapidly down a mountain slope.
(3) Corrosive soil means soil which contains soluble salts which may
produce serious detrimental effects in concrete, metal, or other substances that are
in contact with such soil.
(4) Debris-fan floodplain means a floodplain which is located at the mouth
of a mountain valley tributary stream as such stream enters the valley floor.
(5) Dry wash channel and dry wash floodplain means a small watershed
with a very high percentage of runoff after torrential rainfall.
(6) Expansive soil and rock means soil and rock which contains clay and
which expands to a significant degree upon wetting and shrinks upon drying.
(7) Floodplain means an area adjacent to a stream, which area is subject to
flooding as the result of the occurrence of an intermediate regional flood and which
area thus is so adverse to past, current, or foreseeable construction or land use as
to constitute a significant hazard to public health and safety or to property. The
term includes but is not limited to:
(a) Mainstream floodplains;
(b) Debris-fan floodplains; and
(c) Dry wash channels and dry wash floodplains.
(8) Geologic hazard means a geologic phenomenon which is so adverse to
past, current, or foreseeable construction or land use as to constitute a significant
hazard to public health and safety or to property. The term includes but is not
limited to:
(a) Avalanches, landslides, rock falls, mudflows, and unstable or potentially
unstable slopes;
(b) Seismic effects;
(c) Radioactivity; and
(d) Ground subsidence.
(9) Geologic hazard area means an area which contains or is directly
affected by a geologic hazard.
(10) Ground subsidence means a process characterized by the downward
displacement of surface material caused by natural phenomena such as removal of
underground fluids, natural consolidation, or dissolution of underground minerals or
by man-made phenomena such as underground mining.
(11) Mainstream floodplain means an area adjacent to a perennial stream,
which area is subject to periodic flooding.
(12) Mudflow means the downward movement of mud in a mountain
watershed because of peculiar characteristics of extremely high sediment yield and
occasional high runoff.
(13) Natural hazard means a geologic hazard, a wildfire hazard, or a flood.
(14) Natural hazard area means an area containing or directly affected by a
natural hazard.
(15) Radioactivity means a condition related to various types of radiation
emitted by natural radioactive minerals that occur in natural deposits of rock, soil,
and water.
(16) Seismic effects means direct and indirect effects caused by an
earthquake or an underground nuclear detonation.
(17) Siltation means a process which results in an excessive rate of removal
of soil and rock materials from one location and rapid deposit thereof in adjacent
areas.
(18) Slope means the gradient of the ground surface which is definable by
degree or percent.
(19) Unstable or potentially unstable slope means an area susceptible to a
landslide, a mudflow, a rock fall, or accelerated creep of slope-forming materials.
(20) Wildfire behavior means the predictable action of a wildfire under
given conditions of slope, aspect, and weather.
(21) Wildfire hazard means a wildfire phenomenon which is so adverse to
past, current, or foreseeable construction or land use as to constitute a significant
hazard to public health and safety or to property. The term includes but is not
limited to:
(a) Slope and aspect;
(b) Wildfire behavior characteristics; and
(c) Existing vegetation types.
(22) Wildfire hazard area means an area containing or directly affected by
a wildfire hazard.