Zoning Districts | Technical Terms and Land Use Definitions
of service shall not be adjusted for any portion of the classrooms housed in relocatable facilities that are used as transitional facilities or for any specialized facilities housed in relocatable facilities. Except as otherwise defined by the school board pursuant to a board resolution, “transitional facilities” shall mean those facilities that are used to cover the time required for the construction of permanent facilities; provided, that the “necessary financial commitments” as defined in SDC 21.06.040 are in place to complete the permanent facilities called for in the capital plan. 350. Steep slope hazard areas. Those landslide hazard areas in the City on slopes 40 percent or steeper within a vertical elevation change of at least 10 feet. A slope is delineated by establishing its toe and top and is measured by averaging the inclination over at least 10 feet of vertical relief. For the purpose of this definition: a. The toe of a slope is a distinct topographic break in slope that separates slopes inclined at less than 40 percent from slopes 40 percent or steeper. Where no distinct break exists, the toe of a steep slope is the lowermost limit of the area where the ground surface drops 10 feet or more vertically within a horizontal distance of 25 feet; and b. The top of a slope is a distinct, topographic break in slope that separates slopes inclined at less than 40 percent from slopes 40 percent or steeper. Where no distinct break exists, the top of a steep slope is the uppermost limit of the area where the ground surface drops 10 feet or more vertically within a horizontal distance of 25 feet.
c. A distinct topographic break occurs when the change in gradient is less than five feet vertically within a horizontal distance of 25 feet. 351. Stream functions. Natural processes performed by streams including functions that are important in facilitating food chain production, providing habitat for nesting, rearing, and resting sites for aquatic, terrestrial, and avian species, maintaining the availability and quality of water, such as purifying water, acting as recharge and discharge areas for groundwater aquifers, moderating surface and storm water flows and maintaining the free flowing conveyance of water, sediments, and other organic matter. 352. Streams. Those areas in the City where surface waters produce a defined channel or bed, not including irrigation ditches, canals, storm or storm water runoff conveyance devices or other entirely artificial watercourses, unless they are used by salmonids or are used to convey streams naturally occurring prior to construction of such watercourses. For the purpose of this definition, a defined channel or bed is an area that demonstrates clear evidence of the passage of water and includes, but is not limited to, bedrock channels, gravel beds, sand and silt beds, and defined-channel swales. The channel or bed need not contain water year-round. For the purpose of defining the following categories of streams, normal rainfall is rainfall that is at or near the mean of the accumulated annual rainfall record, based upon the water year for King County as recorded at the Seattle-Tacoma International Airport. a. Streams shall be classified according to the following criteria:
252 | Title 21: Sammamish Development Code
Effective | January 1, 2022
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