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The following information is to be provided for all projects affected by the HDZ.
A.
information, including proposed
area, amount of
by square feet and percentage of lot area, proposed contours, and locations of all areas of cut and
.
B. Topographic information of the existing terrain, prior to any
,
, clearing,
, or modification, with contour intervals.
C. The location, size, color, and textural treatment of all retaining walls, riprapped
, or other constructed means of
stabilization must be shown on one of the plans submitted.
D. The following
analysis information must be provided on the plan. For specific information on calculations of
, refer to Section 9-01.4.0,
Analysis Standard.
1. The average natural cross
(ACS) analysis must be submitted with the plat or plan, and the ACS must be listed in the general notes on the plat or plan.
2. If the standards of Section 5.2.5, Development Standards, of the UDC require an analysis of sloped areas, those areas of 15% or greater must be shown on a topographic map.
E. A note must be added to the plan or plat listing those lots which are subject to HDZ
requirements.
F. All protected peaks and ridges must be shown and labeled, and the 300-foot setback area must be delineated.
The Average Natural Cross
(ACS) of a
is determined in the following manner.
A. The
is depicted on a topographic map of the existing terrain, prior to any
,
, clearing,
, or modification, utilizing a scale no smaller than one inch equals 100 feet, with the following contour intervals.
1. For parcels less than five acres, a contour interval of two feet;
2. For parcels five acres and greater, a contour interval of ten feet.
B. The length of each contour line contained within the
boundaries on the map is measured by means of a mechanical device such as a map wheel or digitizer. This actual length is converted to scale length in feet. For example, at a scale of one inch equals 40 feet, a contour line with an actual map length of six and one-half inches represents a line 260 feet long (6.5 x 40 = 260).
C. The sum of the lengths (L) of all contour lines is multiplied by the contour interval (I) in feet.
D. The result is multiplied by the factor .0023, which converts the square footage of the scale map to acres.
E. This result is then divided by the area (A) of the
in acres.
F. This result is multiplied by a linear adjustment factor which equals the number of contour lines less one line (N - 1), divided by the number of contour lines (N).
G. This process is mathematically represented by the formula:
ACS = (I) (L) (.0023) X (N - 1)
(A) (N)
H. The answer is the percentage of the ACS for the
.
The
of any topography is determined by the following method.
A. The
or lot is depicted on a map with a scale and contour interval conforming to Sections 2-03.2.3.F or 2-05.2.3.E.
B. A
gauge is prepared at the same scale as the map to be analyzed, as follows.
1. On a straight edge of a piece of stiff paper, such as an index card or other straight-edged material, a straight line representing 100 linear feet is marked parallel to the edge.
2. This line is divided into 15 equal divisions, with the 16 marks between the divisions being numbered. Marks zero and 15 will fall at each end of the scale 100 foot line. These marks represent the distance between one-foot contour intervals at a 15%
for the scale used.
C. The contours on the map are compared to the
gauge by placing the gauge perpendicular to the contour lines. When the contour lines are equal to or are closer together than the corresponding interval marks on the gauge, a
of 15% or greater is indicated.
D. All
of 15% or greater are then outlined and so indicated on the map. Submittal of
information is required to allow the Engineering Review Section at the Planning and Planning and Development Services Department (PDSD) to review, comment upon, and make recommendations concerning the appropriateness of the location of the
.
Exception. Any sloped area no greater than 15 feet in any horizontal direction and no greater than seven and one-half feet vertically may be excluded from compliance with this section. Adjacent exempted areas are not cumulative.
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