Dwelling Unit. The single unit or apartment providing complete, independent living facilities for one or more persons, including permanent provisions for living, sleeping, eating, cooking, and sanitation.

Equivalent Residential Unit (ERU). The median average of impervious surface area of a dwelling unit which is estimated to place approximately equal demand on the public stormwater system facilities. One (1) ERU is equal to two thousand five hundred (2,500) square feet of impervious surface area.

Impervious Surface. Those surfaces which either prevent or retard saturation of water into the land surface and cause water to run off the land 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.

Impervious Surface Area. The number of square feet of horizontal surface covered by buildings or other impervious surfaces. All building measurements shall be made between exterior faces of walls, foundations, columns, or other means of support or enclosure.

Operating Budget. The annual Stormwater System budget adopted by the City for the succeeding fiscal year.

Single Family Unit (SFU). A single family dwelling as defined Title 17. A SFU is presumed to have 2,500 square feet of impervious surface area for purposes of this ordinance. The term SFU is inclusive of those units identified as detached single-family residences, unit ownerships, etc.

Stormwater Management. The planning, design, construction, regulation, improvement, repair, maintenance, and operation of facilities and programs relating to water, flood control, grading erosion, tree conservation, and sediment control.

Stormwater Management Fund or Fund. The fund maintained by the City to operate, maintain, and improve the stormwater system.