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Standards for Stormwater Release Rates

The New York City Department of Environmental Protection (DEP) amended Chapter 31 of Title 15 of the Rules of the City of New York (RCNY), the existing rules governing house and site connections to the city’s sewer system (“existing rules”).  The rule amendment modifies the flow rate of stormwater to the city’s combined sewer system for new and existing development, as part of sewer availability and connection approvals (“proposed action”), and applies to development lots where new buildings (“new developments”) or alterations of existing buildings that would result in an expansion of building footprint or impervious surfaces (“alterations”) are proposed. The purpose of the rule amendment is to more stringently control the flow of stormwater runoff from development lots to the city’s sewer system in an effort to improve the performance of the system and provide additional capacity in the system, while ensuring that the system is protected from uncontrolled or pressurized flow.

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