N.Y.C. Admin. Code § PC 1104: Section PC 1104: Conductors and Connections

1104.1 Prohibited use.

Conductor pipes shall not be used as soil, waste or vent pipes, and soil, waste or vent pipes shall not be used as conductors.

1104.2 Floor drains.

Floor drains shall not be connected to a storm drain.

1104.3 Combining storm with sanitary drainage.

The sanitary and storm drainage systems of a structure shall be entirely separate except for minor modifications to existing buildings having combined systems. Where a combined building drain is utilized, the building storm drain shall be connected in the same horizontal plane through a single-wye fitting to the building drain at least 10 feet (3048 mm) downstream from any soil stack. If a separate city storm sewer is not available, building sanitary drains shall be separate and shall only be permitted to connect to a common building combined drain downstream of building (house) trap.

1104.4 Clear water drains.

Drains carrying clear water, i.e., air-conditioning drips, pump drips, cooling water, etc., may discharge into the storm water drainage system through an indirect waste connection discharging into a trapped funnel or raised lip floor drain.

Exception:

Cooling tower blow-down shall discharge into the sanitary drainage system.

1104.5 Parking garage floor drains.

Floor drains provided in open or enclosed parking garages shall drain to the storm drainage system.

Exception:

Where the storm drainage system discharges to a dedicated storm sewer, parking garage floor drains shall be connected to the sanitary drainage system.