§ 31-03 Stormwater Performance Standard for Connections to Combined or Storm Sewer Systems.
RCNY § 31-03
(a)Stormwater release rates. The following provisions apply to the issuance of permits for sewer availability certifications and connections to combined and storm sewer systems for new buildings and alterations as defined in the Construction/Plumbing Codes and related requirements for any horizontal building enlargement or any proposed increase in impervious surfaces.
(1)The maximum Stormwater Release Rates are set forth in the following table. Sewer TypeMaximum Stormwater Release RateStorm Sewer System1 cfs per acre or 0.046 cfs, whichever is greaterCombined Sewer System0.1 cfs per acre or 0.046 cfs, whichever is greater (2) For applications where the site is part of a lot, the stormwater release rate for the altered area must be no more than the stormwater release rate for the entire site, determined in accordance with subparagraph (1) above, multiplied by the ratio of the altered area to the total site area. No new points of discharge are permitted.
(3)For sites where stormwater management facilities other than detention systems are proposed, applicants may be entitled to a reduction of the stormwater volume requirement. The NYC Stormwater Manual identifies eligible stormwater management facilities, which must provide a reliable reduction in peak runoff rates for large events, and sets forth methods for determining the amount of volume that may be reduced. Requests for any volume reduction must be shown on the site connection proposal application and reviewed by DEP and must be made in accordance with the NYC Stormwater Manual. (Amended City Record 2/15/2022, eff. 2/15/2022)
