As used in this article, the following terms shall have the meanings indicated:
DISTURBANCE
The placement of impervious surface, the exposure or movement of soil or bedrock, or the clearing, cutting, or removing of vegetation.
IMPERVIOUS SURFACE
Any structure, surface, or improvement that reduces or prevents absorption of stormwater into land, and includes porous paving, paver blocks, gravel, crushed stone, decks, patios, elevated structures, and other similar structures, surfaces, or improvements.
REDEVELOPMENT
The construction of structures or improvements on areas which previously contained structures or other improvements.
STEEP SLOPES
Any slope equal to or greater than 20% as measured over any minimum run of 10 feet. Steep slopes are determined based on contour intervals of two feet or less.