A. Commercial or Industrial Unit shall be as defined in AMC 18.08 as “Commercial, or commercial use” and “Industrial, or industrial use”.

B. Development shall mean any constructed change to improved or unimproved property including, but not limited to, buildings or other structures, private storm drainage facilities, mining, dredging, filling, grading, paving, excavation or drilling operations.

C. Director shall mean the City Director of Public Works/City Engineer or the person designated by the Director.

D. Duplex shall be as defined in AMC 18.08 as “Dwelling, two family or duplex”.

E. Equivalent Residential Unit (ERU) shall mean an area which is estimated to place approximately equal demand on the public storm drainage facilities as defined in AMC 18.08 as “Dwelling, single-family”. One (1) ERU shall be equal to 3,000 square feet of impervious surface.

F. Impervious Surfaces are those surface areas which either prevent or retard saturation of water into the land surface and cause water to run off the land surface in greater quantities or at an increased rate of flow from that present under natural conditions pre-existent to development. Examples of impervious surfaces include, but are not limited to, rooftops, concrete or asphalt sidewalks, walkways, patio areas, driveways, parking lots or storage areas and gravel, oil, macadam or other surfaces which similarly impact the natural saturation or runoff patterns which existed prior to development.

G. Improved Property shall mean any area which has been altered such that the runoff from the site is greater than that which could historically have been expected. Such a condition shall be determined by the Director.

H. Master Plan shall mean the “City of Ashland Drainage Master Plan” prepared by Kramer, Chin and Mayo, Incorporated, dated July 1985 including such amendments to such plan.

I. Mobile Home Park shall be as defined in AMC 18.08 as “Mobile home court, park or subdivision”.

J. Multiple-family unit (MFU) shall be as defined in AMC 18.08 as a “Dwelling, multiple-family”.

K. Open Drainage way shall mean a natural or constructed path, ditch or channel which has the specific function of transmitting natural stream water or storm water from a point of higher elevation to a point of lower elevation.

L. Person responsible shall mean the owner, agent, occupant, lessee, tenant, contract purchaser or other person having possession or control of property or the supervision of an improvement on the property.

M. Runoff Control shall mean any measure approved by the Director that reduces storm water runoff from land surfaces on which development exists.

N. Single-family Unit (SFU) shall be as defined in AMC 18.08 as “Dwelling, single-family” or individual units of “Condominiums”. A SFU is presumed to have 3,000 square feet of impervious surface area for purposes of this chapter. The term SFU shall be inclusive of those units identified as detached single-family residences, unit ownerships, and condominiums, and etc.

O. Storm Drainage Facilities shall mean any structure(s) or configuration of the ground that is used or by its location becomes a place where storm water flows or is accumulated including, but not limited to, pipes, sewers, gutters, manholes, catch basins, ponds, open drainage-ways and their appurtenances. Ashland Creek, Bear Creek, Wrights Creek, Neil Creek, Emigrant Creek, Hamilton Creek, Clay Creek, Tolman Creek or creeks excluded by action of the Council are not storm drainage facilities.

P. Storm Water shall mean water from precipitation, surface or subterranean water from any source, drainage and nonseptic waste water. (Ord. 2788, amended, 1996)