Solano County Zoning Code § 28.99 Airport Flight Obstructions

• A. Purpose . The purpose of the airport flight obstruction areas is to prevent the creation of flight obstruction and thereby protect the lives and property of users of airports and of occupants of land in the vicinity of airports, and to prevent destruction or impairment of the utility of airports and the investment therein.

• B. Airport reference point . Each airport shall submit to the Zoning Administrator or Planning Commission an airport reference point for approval which, when approved, shall be recorded together with its elevation above sea level on the appropriate zoning map. Elevation shall be based on the U.S. Coast and Geographic Survey Datum.

• C. Airport classification . Each airport shall be classified as either personal, secondary, feeder, trunk line, express, continental, intercontinental, intercontinental express, in accordance with Civil Aeronautics Administration of the United States Department of Commerce standards and Section 21666 of the Public Utilities Code of the state, or military.

• D. Airport flight obstruction areas . For each classification of airport, the following airport flight obstruction areas are hereby established, the designation of which and restrictions of height therein shall be combined with the designations of the use districts in which such airport flight areas occur:

  1. Transitional area (V area) . An area adjacent to the approach areas (W, W-1, and W-2) which extends outward from the approach areas.

  2. Inner approach area (W area) . An area a distance of two hundred feet from each end of each runway extending for a distance of ten thousand feet and centered on the extended

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• i. centerline of the runway, being (a) feet wide at the near end of the runway, and flaring to (b) feet wide at ten thousand two hundred feet from the end of the runway.

3. Military inner approach area (W-1) -- Military airport only . An area a distance of two thousand seven hundred fifty feet from each end of each runway, extending for a distance of eight thousand two hundred fifty feet, and centered on the extended centerline of the runway being (a) feet wide at the near end to the runway, and flaring to (b) feet wide at eleven thousand feet from the end of the runway.

4. Outer approach area (W-2 area) -- Military airport only . An area a distance of eleven thousand feet from the end of each runway extending for a distance of fifteen thousand feet and centered on the extended centerline of the runway at a constant four thousand feet of width.

5. Airport safety area (X area) . An area extending from the established airport reference point a distance of (c) feet radius from the airport reference point.

6. Inner flight area (Y area) . An area a distance of (c) feet radius from the established airport reference point and extending to a distance of (d) feet radius from the airport reference point.

7. Outer flight area (Z area) . An area a distance of (d) feet radius from the established airport reference point and extending to a distance of (e) feet radius from the airport reference point.

8. Outer horizontal surface (Z-1 area) -- Military airport only . An area a distance of twenty thousand feet radius from the established airport reference point and extending to a distance of fifty thousand feet from the airport reference point.

9. Outer conical (Z-2 area) -- Military airport only . An area a distance of fifty thousand feet radius from the established airport reference point and extending to a distance of one hundred thousand feet radius from the airport reference point.

10. Variance in distance . Distance designated by letter varies according to type of airport classifications as given in the following table:

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(Revised 2/19)

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11. In addition to the foregoing flight obstruction areas, the County recognizes as a flight obstruction the precision instrument approach zone and transitional zones to the Napa Airport in Napa County. The precision instrument approach zone is established at the south end of the precision instrument runway, 36L for precision instrument landings and takeoffs. The approach zone shall have a width of one thousand feet at a distance of two hundred feet beyond the end of the proposed extension of runway 36L, widening, thereafter, uniformly to the width of sixteen thousand feet at a distance of fifty thousand two hundred feet beyond the end of the proposed extension of the runway, its centerline being the continuation of the centerline of the runway. The transitional zones extend outward and upward at ninety degree angles to the runway centerline and the runway centerline extended at a slope of seven feet horizontally for each foot vertically from sides of the approach surface. Transitional zones extend a distance of five thousand feet measured horizontally from the edge of the approach zones and at ninety degree angles to the extended runway centerline.

12. In addition to the foregoing flight obstruction areas, the County of Solano recognizes as a flight obstruction, the visual approach zone and transitional zones to the University Airport in Yolo County. The visual approach zone is established at the south end of the visual runway 34 for visual landings and takeoffs. The approach zone shall have a width of two hundred fifty feet at a distance of two hundred feet beyond the end of the proposed extension of runway 34, widening, thereafter, uniformly to the width of one thousand two hundred fifty feet beyond a distance of fifty thousand feet beyond the end of the proposed extension of the runway, its centerline being the continuation of the centerline of the runway. The transitional zones extend outward and upward at ninety-degree angles to the runway centerline, and the runway centerline extended at a slope of seven feet horizontally for each foot vertically from sides of the approach surface. Transitional zones extend a distance of five thousand feet, measured horizontally from the edge of the approach zones and at ninety degree angles to the extended runway centerline.

• E. Uses permitted . All uses permitted in the district in which the V, W, W-1, W-2, X, Y, Z, Z-1 or Z-2 area is located, subject, however, to the height limitations of this Section.

• F. Height regulations . No structure or natural growth shall be permitted at greater heights above the elevation of the recorded airport reference point in the flight obstruction areas than the heights indicated in the following table; provided, that such heights shall not supersede other height limitations of this Chapter of a more restrictive nature:

  1. V areas : The allowed elevations of approach areas at the edges of the approach areas and increasing at a ratio of seven-to-one outward and upward, measured at right angles to the axis of the runway except at the extreme end of the approach areas (W and W-2) where the elevation limiting ratio is extended around through ninety degrees until measured parallel to the runway axis. The increase is allowed until restrictive elevations of adjacent X, Y, Z, or Z-1 areas are met.

  2. W areas : Thirty-five feet at two hundred feet from end of runway, increasing in a direct proportion, fifty-to-one to two hundred thirty-five feet at ten thousand two hundred feet from end of runway.

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3. W-1 areas -- Military airport only : Thirty-five feet at two thousand seven hundred fifty feet from end of runway, increasing in a direct proportion, fifty-to-one, to two hundred feet at eleven thousand feet from end of runway.

4. W-2 areas -- Military airport only : Two hundred feet.

5. X areas : Fifty Feet.

6. Y areas : One hundred fifty feet.

7. Z areas : One hundred fifty feet at (d) feet from the airport reference point, increasing in a direct proportion of one foot in height for each twenty feet horizontally, away from the airport reference point.

8. Z-1 areas -- Military airport only : Five hundred feet.

9. Z-2 areas -- Military airport only : Five hundred feet at fifty thousand feet, increasing in a direct proportion of one foot in height for each one hundred feet horizontally away from the airport reference point to a distance of one hundred thousand feet from the airport reference point.

10. In addition to the foregoing height regulations, the County recognizes the height limitations to the precision instrument approach zone to the Napa Airport in Napa County as one foot in height for each fifty feet in horizontal distance, beginning at a point two hundred feet from and at the centerline elevation of the end of the proposed extension of runway 36L, and extending to a distance of ten thousand two hundred feet from the end of the proposed extension of the runway; thence, one foot in height for each forty feet in horizontal distance to a point fifty thousand two hundred feet from the end of the proposed extension of the runway. The transition zones slope upward and outward seven feet horizontally for each foot vertically, beginning at the sides of and at the same elevation of the approach zones, and extended to a horizontal distance of five thousand feet measured at ninety degree angels to the extended runway centerline.

11. In addition to the foregoing height regulations, the County of Solano recognizes the height limitations to the visual approach zone to the University Airport in Yolo County as one foot in height for each twenty feet in horizontal distance, beginning at a point two hundred feet from and at the centerline elevation of the end of the proposed extension of runway 34, and extending to a distance of five thousand feet from the end of the proposed extension of the runway. The transitional zones slope upward and outward seven feet horizontally for each foot vertically, beginning at the sides of and at the same elevation as the approach zones, and extended to a horizontal distance of five thousand feet measured at ninety degree angles to the extended runway centerline.

(Ord. No. 1726, §2)

(Revised 8/15)

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