“Commercial/multifamily” means all property zoned or used for multifamily, commercial, industrial, retail, governmental, or other nonresidential purposes.

“Director” shall mean the city of Vancouver public works director.

“Hard surface” means any impervious surface, a permeable pavement, or a vegetated roof.

“Impervious surface” means a nonvegetated surface area that either prevents or retards the entry of water into the soil mantle as under natural conditions prior to development. A nonvegetated surface area which causes water to run off the surface in greater quantities or at an increased rate of flow from the flow present under natural conditions prior to development. Common “impervious surfaces” include, but are not limited to, rooftops, walkways, patios, driveways, parking lots or storage areas, concrete or asphalt paving, gravel roads, packed earthen materials, and oiled, macadam or other surfaces which similarly impede the natural infiltration of stormwater.

“Pervious surface” means a surface material that allows stormwater to infiltrate into the ground. Examples include lawn, landscape, pasture, native vegetation areas, and permeable pavements.

“Single-family” means all property zoned or used for single-family detached housing units. Except as noted in VMC 14.09.060(C)(2), all other residential development shall be classified as “multifamily.”

“Single-family equivalent unit (SFU)” means the area of impervious surface on a property divided by 2,500 square feet.

“Stormwater Manual” means the Stormwater Management Manual for Western Washington, prepared by the Washington State Department of Ecology Water Quality Program, December 2014. Publication No. 14-10-055 (a revision of Publication No. 12-10-030), five volumes, and as hereafter amended.

“Stormwater permit” means the city of Vancouver’s National Pollutant Discharge Elimination System (NPDES) Western Washington Phase II Municipal Stormwater Permit issued August 1, 2013, which was modified, effective January 16, 2014, by the Washington State Department of Ecology and as hereafter amended or reissued.

“Utility” means city of Vancouver water-sewer-surface water utility. (Ord. M-4359 § 3, 2021; Ord. M-4257 § 7, 2018; Ord. M-4179 § 18, 2016; Ord. M-4022 § 40, 2012; Ord. M-3145 § 1, 1994)