“Open space” means areas left predominately in a natural state to create urban separators and greenbelts, sustain native ecosystems, connect and increase protective buffers for environmentally critical areas, provide a visual contrast to continuous development, reinforce community identity and aesthetics, or provide links between important environmental or recreational resources. Open space functions as protection of natural resources and biodiversity, recreation spaces, support for economic development opportunities, development of neighborhood gathering spaces, promotion of public health benefits and civic and cultural infrastructure.

“Open-work fence” means a fence in which the solid portions are evenly distributed and constitute no more than 50 percent of the total surface area.

“Ordinary high water line (OHWL)” is defined by WAC 77-55-011(16) and means the mark on the shores of all water (e.g., lakes and streams) that will be found by examining the bed and banks and ascertaining where the presence and action of waters are so common and usual and so long continued in ordinary years as to mark upon the soil or vegetation a character distinct from the abutting upland; provided, that in any area where the ordinary high water line cannot be found, the “ordinary high water line” adjoining saltwater is the line of mean higher high water and “ordinary high water line” adjoining freshwater is the elevation of the mean annual flood.

“Outdoor commercial” means a commercial use where the majority of activity occurs outside a permanent structure. “Outdoor commercial” does not include “farmers’ markets” or “public market” as defined in this chapter.

“Outdoor performance center” means an establishment for the performing arts with open-air seating for audiences. Such establishments may include related services such as food and beverage sales and other concessions.

“Outpatient clinic” means a building designed and used for medical or surgical diagnosis, and treatment of persons under the care of doctors and nurses. No housing of patients is provided at such a facility.

“Overburden-cover-to-seam-thickness ratio” means the thickness as measured from the ground surface to the top of the abandoned mine working divided by the extracted thickness of the coal seam, expressed as a ratio. A 10-foot extracted coal seam will have a 10:1 overburden-cover-to-seam-thickness ratio at a depth of 100 feet and a 15:1 overburden-cover-to-seam-thickness ratio at a depth of 150 feet.

“Overspray” means irrigation water applied beyond the landscape area. (Ord. 08-21 § 4 (Exh. C); Ord. 10-17 § 6 (Exh. D); Ord. 06-17 § 5 (Exh. C); Ord. 04-12 § 1 (Exh. A); Ord. 10-10 § 3 (Exh. C); Ord. 14-05 § 2; Ord. 42-02 §§ 2 (21A.06.817, 21A.06.819, 21A.06.820, 21A.06.825, 21A.06.830, 21A.06.831, 21A.06.832). Formerly 18.20.817 – 18.20.832)