A. POLICY. It is the policy of the City of Columbus to manage stormwater and snowmelt runoff on a local basis; to promote natural infiltration of runoff throughout the City to preserve flood storage and enhance water quality; and to address the unique nature of flooding issues within the Flood Management Zone, through the following principles:
a. Maximize water quality and flood control on individual project sites through Better Site Design practices and stormwater management.
b. Minimize land use impacts and improve operational an maintenance efficiency by siting stormwater BMPs, when needed, regionally unless local resources would be adversely affected.
c. Treat stormwater runoff before discharge to surface waterbodies and wetlands, while considering the historic use of City water features.
d. Ensure that future peak rates of runoff are less than or equal to exiting rates.
e. Preserve remaining floodplain storage volume to minimize flood potential throughout the City.
B. REGULATION. A permit incorporating an approve stormwater management plan is required under this rule for development, consistent with the following:
a. A permit is required for subdivision of an area exceeding one acre. This includes subdivision for single-family residential, multi-unit residential, commercial, industrial, or institutional development.
b. A permit is required for development, other than Public Linear Projects, that creates or reconstructs 10,000 square feet or more of impervious surface. This threshold is cumulative of all impervious surface created or reconstructed through multiple phases or connected actions of a single complete project, as defined by the City, on a single parcel or contiguous parcels of land under common ownership, development or use.
c. For Public Linear Projects, a permit is required when one acre or more of impervious surface will be created or reconstructed through multiple phases or connected actions of a single complete project, as defined by the City.
[§ 7D-707 amended by Ord. No. 23-04, effective August 10, 2023.]