"Clean stormwater activities" means programs required under the Alameda County Urban Runoff Clean Water Program and the NPDES Permit; operation and maintenance of the City’s stormwater drainage system; capital improvements to repair, rehabilitate, or replace components of the stormwater drainage system; any other activities related to the foregoing; and the administration of this ordinance.

"Land use category" means that category of land use assigned to a parcel of real property as shown on the most current official assessment roll of the Alameda County Assessor.

"Parcel" means a unit of real property in one ownership as shown on the most current official assessment roll of the Alameda County Assessor; "parcel size" means the area of such a unit as determined from records maintained by Alameda County or the City of Berkeley, except, however, that parcel size shall not include the area of any real property that is lower than the elevation of "mean high water" for Berkeley, California, as defined in the most recent National Ocean Survey published by the U.S. Department of Commerce, National Oceanic and Atmospheric Administration.

"Runoff factor" means the indicator of stormwater generation of a parcel and is based on the average ratio of impervious area to total parcel area for a category of land use.

"Standard Runoff Unit (RU)" means the average estimated amount of impervious area of parcels in the single-family residential land use category, and is the product of the average single-family residential parcel size multiplied by the runoff factor for single-family residential parcels:

5,490 sq. ft. x .4 = 2,196 sq. ft. (Ord. 6124-NS § 1, 1992: Ord. 6070-NS § 2, 1991)