For the purposes of this subchapter, the following definitions shall apply unless the context clearly indicates or requires a different meaning. When not inconsistent with the context, words used in the present tense include the future or past tense, and words in the singular include the plural. Words not defined in this section shall have their usual and customary meaning.
DEPRESSIONAL STORAGE AREA. A low-lying area where stormwater collects; only regulated when the total storage volume of an individual depressional storage area exceeds five cubic feet.
ILLINOIS URBAN MANUAL. The Illinois Urban Manual, 2013 edition, published by the Association of Illinois Soil and Water Conservation Districts.
IMPERVIOUS SURFACE or IMPERVIOUS AREA. Any improvements on a lot that prohibit or substantially retard the drainage of stormwater directly into the soil below, as well as any hard-surfaced, compacted area that does not readily absorb or retain water, including but not limited to: buildings, driveways, sidewalks, patios, decks and similar structures; stone, brick, asphalt and concrete surfaces; graveled areas; swimming pools; and basketball or tennis courts or other hard play surfaces.
LICENSED PROFESSIONAL ENGINEER. An engineer licensed in the State of Illinois, under the Professional Engineering Practice Act of 1989 (225 ILCS 325/1 et seq.).
LOWEST FLOOR ELEVATION. The elevation of the lowest enclosed area of a building, such as a basement floor elevation.
MAINTENANCE ACTIVITIES. Ordinary repairs, in-kind replacement, or replacement with alternate materials, provided that the activity does not result in a change in:
(1) The area of land covered by an impervious surface;
(2) The size of a pipe; or
(3) The elevation of the ground surface.
MAJOR PROJECT. A regulated activity that disturbs 400 square feet or more of the ground surface.
MINOR PROJECT. A regulated activity that disturbs less than 400 square feet of the ground surface.
NAVD88. The North American Vertical Datum of 1988.
(Ord. 1178, passed 10-17-2016)