§ 63.319. Stormwater runoff.

(a)

Stormwater drainage from off-street parking facilities of greater than one-quarter (¼) of an acre of total disturbed area into public sewers shall be controlled so that peak stormwater discharge rates from the site for all storms up to and including the critical 100-year frequency will not exceed:

Q = 1.64 x A

where Q = the maximum acceptable discharge rate in cubic feet per second and A = the site area in acres.

Parking facilities shall be designed in accordance with best management practices to comply with required local and regional water quality, volume, and rate control standards. These standards include but are not limited to chapter 52, stormwater runoff. Parking lots shall also abide by operation and maintenance regulation as specified by local and regional authorities.

(b)

For sites with greater than one-quarter (¼) of an acre of total disturbed area, when the minimum required parking as determined in section 63.207(a) is constructed as surface parking and is exceeded by more than four (4) parking spaces, the following provisions for stormwater management shall apply unless otherwise regulated in an overlay zoning district:

(1)

Thirty (30) square feet of stormwater landscaping shall be provided per parking space over the minimum required parking. Stormwater landscaping shall be designed to include an under drain system if stormwater landscaping is located in areas with hydrologic soil type C (Sandy clay loam).

(2)

Stormwater landscaping shall not be required if located in areas with hydrologic soil type D (Clay); groundwater or bedrock within three (3) feet of the bottom of the infiltration area; nearby wells or utilities; or potential contamination.

(c)

For parking facilities with greater than one (1) acre of total disturbed area, other local, state, and regional regulations also apply.

(C.F. No. 10-403, § 1, 6-16-10)