N.Y.C. Admin. Code § 24-503: § 24-503 Drainage plan.

a. The commissioner of environmental protection shall devise and prepare a plan for the proper sewerage and drainage of the city, so far as the same has not already been done, for the purpose of thoroughly draining and carrying off water and other matter. He or she shall lay out the city into as many sewerage districts as he or she may deem necessary for such purpose, and shall determine and show, on suitable maps or plans:

1. The location, course, size and grade of each sewer and drain proposed for each of such districts;

2. The contemplated depth of such sewers and drains below the present surface and below the established grades of streets and avenues;

3. The proposed alterations and improvements in existing sewers;

4. Such other particulars as may be necessary for the purpose of exhibiting a complete plan of the proposed sewerage therein.

b. Such plan shall indicate the location and size of all sewage disposal works or plants, and the necessary appurtenances thereto, as determined by the department of environmental protection.

c. The commissioner of environmental protection shall submit such map or plan simultaneously to the department of health and mental hygiene, the director of city planning, each affected community board, the office of the appropriate borough president, the appropriate council member, and the appropriate senator and member of assembly. The department of health and mental hygiene shall review such map or plan with respect to the creation or abatement of any health hazard. Such department shall file a statement with the commissioner of environmental protection and the director of city planning, in relation to such map or plan, within fifteen days subsequent to such submission either approving or disapproving such map or plan.

d. The director of city planning shall review and determine the conformance of such map or plan with the city map, as adopted. Upon determination that such map or plan conforms with the city map, such director shall certify such determination to the commissioner of environmental protection. Unless the director shall file a statement with such commissioner in relation to such map or plan within thirty days subsequent to the submission of said map or plan, such map or plan shall be deemed to conform with the city map and shall constitute the certification thereof.

e. Copies of such map or plan as approved in accordance with the provisions of this section shall be filed by the commissioner of environmental protection in each county office of record, the community board for the community in which any portion of such map or plan is situated, the office of the borough president in which any portion of such map or plan is situated within the city of New York, the offices of the council member, senator and member of assembly representing a district in which any portion of such map or plan is situated within the city of New York, and in the offices of the department of transportation and department of health and mental hygiene of such city.

f.* The commissioner of environmental protection shall submit semiannual reports to the mayor and the speaker of the council regarding the inspection, maintenance and repair of catch basins within the jurisdiction of the commissioner, disaggregated by community district. The first semiannual report shall cover the period from July 1, 2016, through December 31, 2016. Such reports shall include the number of catch basins inspected, the number of clogged or malfunctioning catch basins identified, the number of catch basins unclogged or repaired, whether the inspection was in response to a complaint, and the response time for resolution of any complaint. The commissioner of environmental protection shall also ensure that such catch basins are inspected, at a minimum, once every year, and are unclogged or repaired within nine days after an inspection or the receipt of a complaint about a clogged or malfunctioning catch basin. Catch basins not unclogged or repaired within nine days after an inspection or the receipt of a complaint shall be identified in the semiannual report.

f.* The department of environmental protection shall inspect each catch basin under the jurisdiction of the commissioner of environmental protection in accordance with a multi-tiered inspection schedule based on the 10-year rainfall flood risk area map developed pursuant to section 24-809, any other stormwater flood maps maintained by such department, and performance history, including inspection data, maintenance records, and 311 complaints received, of such catch basins. The department of environmental protection shall evaluate such multi-tiered inspection schedule no less than once every 3 years.

g. The department of environmental protection shall resolve each clogged catch basin inspected pursuant to subdivision f of this section within 8 business days of the date on which such department received a complaint about such catch basin being clogged or the date on which such department identified, upon inspection, such catch basin as being clogged, whichever is earlier.

h. No later than September 17, 2026, and no later than every September 17 thereafter, the commissioner of environmental protection shall submit a report to the mayor, the speaker of the council, and the public advocate regarding the inspection, cleanup, and maintenance of catch basins, disaggregated by community district. Each such report shall include a description of the multi-tiered inspection schedule required pursuant to subdivision f of this section and an explanation of any changes made to such multi-tiered inspection schedule since the submission of the prior report. Each such report shall include a list of catch basins about which the department of environmental protection received a complaint of having been clogged or which such department identified, upon inspection, as being clogged, and did not resolve within the time period required by subdivision g of this section.