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For the purposes of this chapter, the following definitions shall apply:

A. “Best management practice” or “BMP” means physical, structural, and/or managerial practices that, when used singly or in combination, prevent or reduce pollution of water. BMPs are listed and described in the storm water management manual.

B. “Person” means any individual, partnership, corporation, association, organization, cooperative, public or municipal corporation, agency of the state, or local government unit, however designated.

C. “Storm water” means that portion of precipitation that does not naturally percolate into the ground or evaporate, but flows via overland flow, interflow, channels or pipes into a defined surface water channel, or a constructed infiltration facility.

D. “Storm water drainage system” means constructed and natural features which function together as a system to collect, convey, channel, hold, inhibit, retain, detain, infiltrate, divert, treat or filter storm water.

E. “Storm water facility” means a constructed component of a storm water drainage system designed or constructed to perform a particular function or multiple functions. Storm water facilities include, but are not limited to, pipes, swales, ditches, culverts, street gutters, detention basins, retention basins, constructed wetlands, infiltration devices, catch basins, oil/water separators, sediment basins and modular pavement. Storm water facilities are described in the manual.

F. “Storm water management manual” or “manual” means the manual adopted by reference and prepared by Ecology that contains BMPs to prevent or reduce pollution (or a technically equivalent manual approved by Ecology). The storm water management manual contains BMPs to prevent or reduce pollution and maintenance provisions for all BMPs. (Ord. 1038, 1994)