A. It is the intent of these regulations to require the use of best management practices (BMPs) per the Eastern Washington Stormwater Manual to minimize, treat, prevent and/or reduce degradation of water quality and flooding potential due to stormwater runoff from parking. The stormwater management system shall be designed, constructed, and maintained with BMPs to minimize runoff volumes, prevent flooding, reduce soil erosion, protect water quality, maintain or improve wildlife habitat, and retain all stormwater on site pursuant to Section 13.35.030.

B. Infiltration of stormwater shall be accommodated to the extent possible through limitation of land disturbance and grade changes, retention of existing natural drainage areas and wetlands, and use or creation of vegetated islands, vegetated medians, and vegetated perimeter buffer strips.

C. Natural drainage patterns shall be maintained to the extent practicable. The applicant must demonstrate, through information provided on and in association with the proposed site plan, the existing and proposed drainage patterns and calculated flows.

D. Measures that shall be considered to reduce the amount of impervious surfaces in all proposed parking lots include: