Int. No. 1150-A

By Council Members Gennaro, Restler, Hanif, Dinowitz, Brannan, Farías, Narcisse, Won, Louis, Rivera, Menin, Brooks-Powers, Krishnan, Gutiérrez, Hanks, Banks and Mealy

A Local Law to amend the administrative code of the city of New York, in relation to the creation of a comprehensive stormwater plan and a stormwater dashboard, and to repeal section 24-526.1 of such code, relating to the creation of a sustainable stormwater management plan

Be it enacted by the Council as follows:

Section 1. Chapter 5 of title 24 of the administrative code of the city of New York is amended by adding a new section 24-503.3 to read as follows:

§ 24-503.3 Comprehensive stormwater plan and stormwater dashboard. a. Definitions. As used in this section, the following terms have the following meanings:

Area of service. The term “area of service” means a geographic area of the city served by infrastructure owned or leased by the city to capture and divert rainfall and minimize street flooding, to be designated by the department.

Department. The term “department” means the department of environmental protection.

Level of service. The term “level of service” means the expected performance of infrastructure owned or leased by the city to capture and divert rainfall and minimize street flooding.

b. Recommended levels of service. No later than July 1, 2026, the department shall designate areas of service that collectively encompass the entire city and recommend a level of service for each such area, provided that each such level shall be sufficient to mitigate expected flood risk in such area. In determining the recommended levels of service, the department shall consider plans, studies, and reports concerning stormwater flooding, including but not limited to the Southeast Queens flood mitigation plan required pursuant to section 24-530 and the environmental justice plan required pursuant to section 3-1003. After July 1, 2026, the department may revise the areas of service and recommended levels of service, provided that such levels, as revised, comply with this subdivision.

c. Technical progress reports. No later than July 1, 2027, and every 2 years thereafter until the department submits the comprehensive stormwater plan required pursuant to subdivision d of this section, the department shall publish a technical progress report on the development of such comprehensive stormwater plan. Each such technical progress report shall: provide an update on the status of such comprehensive stormwater plan; include a map of the areas of service designated by the department and indicate the recommended level of service for each such area, noting any revisions since the date of the previous technical progress report; provide an update on each project, policy, or other measure that the department has recommended, developed, or implemented to provide the recommended levels of service since the date of the previous technical progress report; recommend additional projects, policies, or other measures to provide the recommended levels of service, including measures that owners of private property could adopt to mitigate stormwater flooding, with priority given to such projects, policies, or other measures which address areas of the city most vulnerable to stormwater flooding; and indicate the department’s most recent estimate of the date by which the stormwater infrastructure of the city will achieve the recommended levels of service.

d. Comprehensive stormwater plan. No later than July 1, 2035, the department shall publish, in consultation with the office of long-term planning and sustainability, a comprehensive stormwater plan for the city. Such plan shall: include a map of the areas of service designated by the department; indicate the recommended level of service for each area of service; describe and provide an update on each project, policy, or other measure that the department has recommended, developed, or implemented to provide the recommended levels of service; recommend additional projects, policies, or other measures to provide the recommended levels of service, including measures that owners of private property could adopt to mitigate stormwater flooding, with priority given to such projects, policies, or other measures which address areas of the city most vulnerable to stormwater flooding; and provide a timeline for the expected implementation of such recommended projects, policies, or other measures and for the achievement of the recommended levels of service.

e. Stormwater dashboard. 1. No later than July 1, 2026, the department shall create and maintain a stormwater dashboard on the website of the department. Such dashboard shall: indicate the status of the comprehensive stormwater plan; describe the 10-year rainfall flood risk area or provide reference to the maps of such area created pursuant to section 24-809; include a map of the areas of service designated by the department; indicate the recommended level of service for each area of service; and indicate the status of each project, policy, or other measure that the department has recommended to provide the recommended levels of service. The department shall update such dashboard to include additional recommended projects, policies, or other measures and to reflect any revisions to the areas of service or recommended levels of service.

2. Upon publication of the comprehensive stormwater plan, such dashboard shall be updated to: include such comprehensive stormwater plan; indicate the status of each project, policy, or other measure recommended by such plan; and indicate the expected date of implementation of each such project, policy, or other measure. If the department determines that any such project, policy, or other measure shall no longer be recommended, or is otherwise not likely to be implemented, such project, policy, or other measure shall remain listed on such dashboard, with its status indicated as appropriate. If the department revises the areas of service or recommended levels of service after publication of the comprehensive stormwater plan, such department shall update the dashboard accordingly.

3. The department shall update such dashboard no less than once annually.

§ 2. Section 24-526.1 of the administrative code of the city of New York is REPEALED.

§ 3. Section 24-533 of the administrative code of the city of New York, as added by local law number 154 for the year 2023, is amended to read as follows:

a. The commissioner, in collaboration with the department of buildings, shall publish on the green infrastructure program map, or on another map on the department’s website, the location of every green roof[, as defined in section 24-526.1,] in the city, using the best information available.

b. For each green roof indicated on such map, the map shall provide at a minimum, based on the best information available, the following information:

1. The occupancy group of the building or structure;

2. The area of the roof in square feet;

3. The area of the portion of the roof covered by the green roof system in square feet;

4. The estimated amount of water such green roof has the capacity to absorb; and

5. Any functions of the green roof, which may include, but need not be limited to, aesthetic, water retention, recreational, farming, or any other function designated by the department.

c. Definitions. For purposes of this section, the term “green roof” means a living vegetative system partially or wholly covering a roof.

§ 4. This local law takes effect immediately.

AGB/BJR/SNT

LS #18508                     

04/16/2025 8:13PM