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H. Slope (Grade). <br /> Slope, also referred to as grade, is the ratio of height (rise) over distance <br /> (run) for a segment of land, where a vertical line would have an infinite slope. For <br /> example, a vertical rise of one foot over a horizontal run of one foot has a slope of <br /> 100-percent. The 25-percent slope standard used in this chapter is, therefore, the <br /> ratio of a one-foot rise over a four-foot run, i.e., 25 percent. Slopes are typically <br /> measured between adjacent contour lines and perpendicular to the contour lines. <br /> Figure 3, below, shows the 25-percent slope as a one uni: rise over a four <br /> unit run. <br /> -15 100% (45°) <br /> �►' 75% (36.87°) <br /> �3 50% (26.57*) <br /> 40% (21.80°) <br /> 3096 (16,70') <br /> — 25% Slop„ <br /> 0 <br /> 20% (11,31°) (14.00") <br /> 10% (5.71°) 1 unit rise <br /> -1---0% (0°) <br /> — grade — angle — 4 unit run <br /> Figure 3: 25-percent slope. <br /> 18.70.060 Required Information. <br /> Any commercial development or residential development of 11 units or greater for <br /> properties which have land areas containing 25-percent or steeper slopes shall be <br /> accompanied by data prepared by a registered Civil Engineer, or by a registered Land <br /> Surveyor at the discretion of the Community Development Director, or his or her <br /> designated representative. <br /> The following data shall be in addition to the information required by this title for <br /> applications for Design Review, Planned Unit Development, and Major Modifications of <br /> Planned Unit Developments: <br /> 7 <br />