No building permit shall be issued for any building, structure or improvement which does not comply with chapter 8 of the Bartlett subdivision and PUD ordinance (title 11 of the Bartlett municipal code), even if the underlying property is not proposed to be subdivided. To the extent any development is not subject to the provisions of the Bartlett subdivision and PUD ordinance, the purpose of this section is to provide standards and regulations governing stormwater management for such land development in order to reduce or to prevent flooding and, at the same time, minimize damage to real property, and the following requirements shall apply in all districts. In addition, all storm water will need to comply with section 9-20-11, "Impervious Surface", of the Bartlett zoning ordinance.
A. Excess Stormwater: The controlled release and storage of excess stormwater runoff shall be required in combination for all business and industrial development sites which exceed one acre in area, and for all residential developments of fifty (50) lots or three (3) acres, whichever is less. Exceptions may be granted based on evidence by an engineering drainage study approved by the village board.
B. Release Rate Of Stormwater: The controlled release of stormwater runoff from all developments shall not exceed the existing safe storm drainage capacity of the natural downstream outlet channel or storm sewer system. The release rate shall be an average value computed as a direct ratio to the tributary watershed area. In any case, the value shall not exceed 0.10 cfs per acre from an area designed to provide storage from excess stormwater or at a proportional rate of the most restrictive capacity of downstream channel or compatible with the "safe" capacity of most village rivers and streams. The rate of which stormwater runoff is transported into a designated stormwater storage area shall be unrestricted. Control structure piping shall be not less than four inches (4") in diameter. (Ord. 2014-46, 6-3-2014; amd. Ord. 2020-56, 6-16-2020)