The permitted density of development on lands with steep slopes shall be as follows:
(a) There shall be a reduction in density from that which is allowable in the zone district whenever more than thirty (30) percent of the total land area of a project is encumbered by slopes of forty-five (45) percent and greater. The gross allowable density of the project shall be reduced by one (1) percent for each one (1) percent exceeding thirty (30) percent of land area having slopes of forty-five (45) percent and greater.
(b) The calculation of the formula in subdivision A is as follows: Assuming a three thousand one hundred (3,100) acre parcel of land on which fifty (50) percent of the total land area has slopes greater than forty-five (45) percent, the gross allowable zoned density is three thousand one hundred (3,100) acres divided by thirty (30) (one unit per thirty (30) acres) = one hundred three (103) units allowed. The density reduction is calculated as follows:
(c) An example of the application of the formula to a three thousand one hundred (3,100) acre parcel in RS-30 where the gross zoned density is one hundred three (103) units is given below, assuming different amounts of land with slopes greater than forty-five (45) percent.
TABLE 5-2: Density Reductions for Steep Slopes
Land Area in Excess of 45% Density Reduction Units Substracted Net Units
0-30% 0% 0 103
45 15 15 88
50 20 21 82
60 30 31 72
75 45 46 57
85 55 57 46
95 65 67 36
(d) In order to determine the amount of land area having slopes of forty-five (45) percent and greater, the applicant shall submit a slope analysis using ten (10) foot contoured topography obtained from the Pitkin County Geographic Information Systems (GIS) Department. In the event that ten (10) foot contours do not provide enough detail to adequately determine slope, a certified survey delineating two (2) foot contours may be required at the County Planner’s discretion.
(Code repealed and reenacted (all sections) by Ord. 014-D-2006, 07-05-06; § 5-10-20 (part) amended Ord. 023-07, 08-28-07)