Chapter 1 Administration

Chapter 2 Definitions

Chapter 3 General Regulations

Chapter 4 Fixtures, Faucets and Fixture Fittings

Chapter 5 Water Heaters

Chapter 6 Water Supply and Distribution

Chapter 7 Sanitary Drainage

Chapter 8 Indirect/Special Waste

Chapter 9 Vents

Chapter 10 Traps, Interceptors and Separators

Chapter 11 Storm Drainage

Chapter 12 Special Piping and Storage Systems

Chapter 13 Referenced Standards [PDF]

Appendix A Plumbing Permit Fee Schedule [Reserved]

Appendix B Rates of Rainfall for Various Cities [Reserved]

Appendix C Water Conservation Systems

Appendix D Degree Day and Design Temperatures [Reserved]

Appendix E Sizing of Water Piping System

Appendix F Structural Safety (Reserved)

Appendix G Vacuum Drainage System (Reserved)

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The provisions of this chapter shall govern the materials, design, construction and installation of storm drainage. Storm water discharge shall be in accordance with city department of environmental protection requirements.
All roofs, paved areas, yards, courts and courtyards shall drain into a separate storm sewer system, or a combined sewer system, or to an approved place of disposal. In accordance with city department of environmental protection requirements, an approved system for beneficial collection and use of storm water may be installed in which case overflow from such a system shall be discharged to street storm sewer or street combined sewer.
Whenever an alteration increases impervious surfaces on the lot to greater than 20 percent of the impervious surfaces existing when the structure was constructed, such impervious surfaces shall drain into a storm sewer system, or a combined sewer system, or to an approved place of disposal.
  Exception: Where the total area of impervious surfaces proposed to be increased by an alteration after the effective date of this code is less than or equal to 1,000 square feet (93 m2).
Storm water shall not be drained into sewers intended for sewage only.
The conductors and the building storm drain shall be tested in accordance with Section PC 312.
The size of a drainage pipe shall not be reduced in the direction of flow.
All connections and changes in direction of the storm drainage system shall be made with approved drainage-type fittings in accordance with Table 706.3. The fittings shall not obstruct or retard flow in the system.
Roofs shall be designed for the maximum possible depth of water that will pond thereon as determined by the relative levels of roof deck and overflow weirs, scuppers, edges or serviceable drains in combination with the deflected structural elements. In determining the maximum possible depth of water, all primary roof drains shall be assumed to be blocked.
Cleanouts shall be installed in the storm drainage system and shall comply with the provisions of this code for sanitary drainage pipe cleanouts.
  Exception: Subsurface drainage system.
Backwater valves installed in a storm drainage system shall conform to Section PC 715.
Backwater valves shall be installed in storm drainage systems in accordance with Section 7.3.4 of ASCE 24 as modified by Appendix G of the New York City Building Code for all buildings located in the areas of special flood hazard, as established by Section G102.2 of Appendix G of the New York City Building Code.
Plastic piping and fittings shall not be used.
  Exceptions:
  1. Plastic piping and fittings may be used in residential buildings five stories or less in height.
  2. Corrugated polyethylene piping and fittings, with a diameter of twelve inches (305 mm) or more may be used in connection with any type of building for underground yard drainage and storm water piping when used outside of the foundation wall of the building and not connecting to any piping system from the interior of the building.
Except as otherwise permitted by this code, no person shall perform site grading or land contour work, as defined in section 19-146 of the Administrative Code, which work would causes storm water to flow across sidewalks or onto an adjacent property.
The materials and methods utilized for the construction and installation of storm drainage systems shall comply with this section and the applicable provisions of Chapter 7.
Inside storm drainage conductors installed above ground shall conform to one of the standards listed in Table 702.1.
Underground building storm drain pipe shall conform to one of the standards listed in Table 702.2.
Building storm sewer pipe shall conform to one of the standards listed in Table 1102.4.
Table 1102.4
Building Storm Sewer Pipe


Material

Standard








Cast-iron pipe

ASTM A 74; ASTM A 888; CISPI 301








Concrete pipe

ASTM C 14; ASTM C 76; CAN/CSA A257.1M; CAN/CSA A257.2M








Ductile-iron pipe

AWWA C151








High density polyethylene pipe (HDPE)a

ASTM D 3350








Non-asbestos fiber-cement pipe

ASTM C 1449








Polyvinyl chloride (PVC) plastic pipe (Type DWV, SDR26, SDR35, SDR41, PS50 or PS100)a

ASTM D 2665; ASTM D3034; ASTM F 891; CSA B182.2; CAN/CSA B182.4








Vitrified clay pipe

ASTM C 4; ASTM C 700








Stainless steel drainage systems, Type 316L

ASME A112.3.1







a. Approved plastic sewer for piping 12 inches and larger.
Subsoil drains shall be open-jointed, horizontally split or perforated pipe conforming to one of the standards listed in Table 1102.5.
Table 1102.5
Subsoil Drain Pipe


Material

Standard








Cast-iron pipe

ASTM A 74; ASTM A 888; CISPI 301








Polyethylene (PE) plastic pipe

ASTM F 405








Polyvinyl chloride (PVC) plastic pipe (type sewer pipe, PS25, PS50 or PS100)

ASTM D 2729; ASTM F 891; CSA B 182.2; CAN/CSA B182.4








Porous concrete pipe

ASTM C 654








Vitrified clay pipe

ASTM C 4; ASTM C 700








Stainless steel drainage systems, Type 316L

ASME A112.3.1







Roof drains shall conform to ASME A112.21.2M or ASME A112.3.1.
Pipe fittings shall be approved for installation with the piping material installed, and shall conform to the respective pipe standards or one of the standards listed in Table 1102.7. The fittings shall not have ledges, shoulders or reductions capable of retarding or obstructing flow in the piping. Threaded drainage pipe fittings shall be of the recessed drainage type.
Table 1102.7
Pipe Fittings


Material

Standard








Cast-iron

ASME B16.4; ASME B16.12; ASTM A 888; CISPI 301; ASTM A 74








Chlorinated polyvinyl chloride (CPVC) plastic

ASTM F 437; ASTM F 438; ASTM F 439









ASME B16.15; ASME








Gray iron and ductile iron

AWWA C110








High-density polyethylene (HDPE)

ASTM D 3350








Malleable iron

ASME B16.3








Plastic, general

ASTM F 409








Polyethylene (PE) plastic

ASTM D 2609








Polyvinyl chloride (PVC) plastic

ASTM D 2464; ASTM D2466; ASTM D 2467; CSA B137.2; ASTM D 2665; ASTM F 1866








Steel

ASME B16.9; ASME B16.11; ASME B16.28








Stainless steel drainage systems, Type 316L

ASME A112.3.1







Leaders and storm drains connected to a combined sewer shall be trapped. Individual storm water traps shall be installed on the storm water drain branch serving each conductor, or a single trap shall be installed in the main storm drain just before its connection with the combined building sewer or the public sewer. A hooded catch basin located within the street line shall be the equivalent of a building house trap for the connection to a street combined sewer.
Storm water traps shall be of the same material as the piping system to which they are attached.
Traps for individual conductors shall be the same size as the horizontal drain to which they are connected.
An accessible cleanout shall be installed on the building side of the trap.
Conductor pipes shall not be used as soil, waste or vent pipes, and soil, waste or vent pipes shall not be used as conductors.
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 combined sewer 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 common building combined sewer downstream of building house trap.
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.
Roof drains shall have strainers extending not less than 4 inches (102 mm) above the surface of the roof immediately adjacent to the roof drain. Strainers shall have an available inlet area, above roof level, of not less than one and one-half times the area of the conductor or leader to which the drain is connected.
Roof drain strainers for use on sun decks, parking decks and similar areas that are normally serviced and maintained shall comply with Section 1105.1 or shall be of the flat-surface type, installed level with the deck, with an available inlet area not less than two times the area of the conductor or leader to which the drain is connected.
The connection between roofs and roof drains which pass through the roof and into the interior of the building shall be made water tight by the use of approved flashing material.
The size of the vertical conductors and leaders, gutters, building storm drains, building storm sewers, and any horizontal branches of such drains or sewers shall be based on the 100-year hourly rainfall rate of 3 inches (76 mm) per hour. Sizing for secondary and combined primary and secondary conductors, leaders and drains shall be in accordance with Section PC 1107.
Vertical conductors and leaders shall be sized for the maximum projected roof area, in accordance with Table 1106.2.
Table 1106.2
Size of Vertical Conductors and Leaders


Diameter
of Leader
(inches)
a
Horizontally
Projected Roof Area
(square feet)

Rainfall rate (inches
per hour)

3








2

960








3

2,930








4

6,130








5

11,530








6

17,995








8

38,660







For SI: 1 inch = 25.4 mm, 1 square foot = 0.0929 m2.
a.
Sizes indicated are the diameter of circular piping. This table is applicable to piping of other shapes provided the cross-sectional shape fully encloses a circle of the diameter indicated in this table.
The size of the building storm drain, building storm sewer and their horizontal branches having a slope of one-half unit or less vertical in 12 units horizontal (4 percent slope) shall be based on the maximum projected roof area in accordance with Table 1106.3. The minimum slope of horizontal branches shall be one-eighth unit vertical in 12 units horizontal (1 percent slope) unless otherwise approved.
Table 1106.3
Size of Horizontal Storm Drainage Piping


Size of
Horizontal
Piping
(inches)

Horizontally Projected Roof Area (square feet)
________________________________________
Rainfall rate (inches per hour)







  3
  6








                1/8 unit vertical in 12 units horizontal (1 percent slope)














3

1,096

548


4

2,506

1,253


5

4,453

2,227


6

7,133

3,566


8

15,330

7,600


10

27,600

13,800


12

44,400

22,200


15

72,800

39,650










                1/4 unit vertical in 12 units horizontal (2 percent slope)














3

1,546

773


4

3,533

1,766


5

6,293

3,146


6

10,066

5,033


8

21,733

10,866


10

38,950

19,450


12

62,600

31,350


15

112,000

56,000










                1/2 unit vertical in 12 units horizontal (4 percent slope)














3

2,295

1,096


4

5,010

2,500


5

8,900

4,450


6

13,700

7,140


8

30,650

15,320


10

55,200

27,600


12

88,800

44,400


15

158,800

79,250









For SI: 1 inch = 25.4 mm, 1 square foot = 0.0929 m2.
In sizing roof drains and storm drainage piping, one-half of the area of any vertical wall that diverts rainwater to the roof shall be added to the projected roof area for inclusion in calculating the required size of vertical conductors, leaders and horizontal storm drainage piping.
Parapet wall roof drainage scupper and overflow scupper location shall comply with the requirements of the New York city building code.
The size of semicircular gutters shall be based on the maximum projected roof area in accordance with Table 1106.6.
Table 1106.6
Size of Semicircular Roof Gutters


Diameter of
Gutters
(inches)
  

Horizontally Projected Roof Area (square feet)
________________________________________
Rainfall rate (inches per hour)

  3




1/16 unit vertical in 12 units horizontal (0.5 percent slope)








3

226


4

480


5

834


6

1,280


7

1,840


8

2,655


10

4,800









1/8-unit vertical in 12 units horizontal (1 percent slope)








3

320


4

681


5

1,172


6

1,815


7

2,600


8

3,740


10

6,800









1/4 unit vertical in 12 units horizontal (2 percent slope)








3

454


4

960


5

1,668


6

2,560


7

3,860


8

5,310


10

9,600









1/2 unit vertical in 12 units horizontal (4 percent slope)








3

640


4

1,360


5

2,360


6

3,695


7

5,200


8

7,460


10

13,330







For SI: inch = 25.4 mm, 1 square foot = 0.0929 m2.
Secondary (emergency) roof drains or scuppers shall be provided where the roof perimeter construction extends above the roof in such a manner that water will be entrapped if the primary drains allow buildup for any reason. The inlet elevation of secondary (overflow) drains and the invert elevation of overflow scuppers should be not less than 2 inches (51 mm) or more than 4 inches (102 mm) above the low point of the (adjacent to) roof surface unless a safer water depth loading, including the required hydraulic head to maintain required flow rate out of the overflow drainage system that has been determined by the structural design.
Where practical secondary roof drain systems shall have the end point of discharge separate from the primary system. Discharge shall be above grade, in a location which would normally be observed by the building occupants or maintenance personnel. Where separate systems are impractical and to prevent water from flowing over sidewalk or pedestrian walkways, secondary drainage system may tie into the primary drainage system in the vertical conductors.
Secondary (emergency) roof drain systems shall be sized in accordance with Section PC 1106 based on the rainfall rate of 3 inches (76 mm) per hour. Scuppers shall be sized to prevent the depth of ponding water from exceeding that for which the roof was designed as determined by Section 1101.7. Scuppers shall not have an opening dimension of less than 4 inches (102 mm). Where secondary drainage systems tie into primary drainage systems, the combined primary and secondary system shall be sized based on their combined rainfall rate of 6 inches (152 mm) per hour.
The size of a combination sanitary and storm drain or sewer shall be computed in accordance with the method in Section 1106.3. The fixture units shall be converted into an equivalent projected roof or paved area. Where the total fixture load on the combined drain is less than or equal to 256 fixture units, the equivalent drainage area in horizontal projection shall be taken as 1333 square feet (124m 2 ). Where the total fixture load exceeds 256 fixture units, each additional fixture unit shall be considered the equivalent of 5.2 square feet (.48m 2 ) of drainage area. These values are based on a rainfall rate of 3 inch (75 mm) per hour.
Where there is a continuous or semicontinuous discharge into the building storm drain or building storm sewer, such as from a pump, ejector, air conditioning plant or similar device, each gallon per minute of such discharge shall be computed as being equivalent to 32 square feet (2.97m 2 ) of roof area, based on a rainfall rate of 3 inches (75 mm) per hour.
The roof of a structure shall be designed for the storage of water where the storm drainage system is engineered for controlled flow. The controlled flow roof drain system shall be an engineered system in accordance with this section and Section 28–113.2.2 of the Administrative Code. The controlled flow system shall be designed based on the design rainfall rate in accordance with Section 1106.1.
The control devices shall be installed so that the rate of discharge of water per minute shall not exceed the values for continuous flow as indicated in Section 1109.1.
Runoff control shall be by control devices. Control devices shall be protected by strainers.
Not less than two roof drains shall be installed in roof areas 10,000 square feet (929m 2 ) or less and not less than four roof drains shall be installed in roofs over 10,000 square feet (929m 2 ) in area.
Subsoil drains shall be open-jointed, horizontally split or perforated pipe conforming to one of the standards listed in Table 1102.5. Such drains shall not be less than 4 inches (102 mm) in diameter. Where the building is subject to backwater, the subsoil drain shall be protected by an accessibly located backwater valve. Where subsoil drainage is discharged into a public sewer, the sub-soil drains shall discharge into a readily accessible silt and sand interceptor before being connected into the gravity drainage or sump system. Subsoil drainage shall discharge to a trapped area drain, sump, dry well or approved location above ground. The subsoil sump shall not be required to have either a gas-tight cover or a vent. The sump and pumping system shall comply with Section 1113.1.
Building subdrains located below the public sewer level shall discharge into a sump or receiving tank, the contents of which shall be automatically lifted and discharged into the drainage system as required for building sumps. The sump and pumping equipment shall comply with Section 1113.1.
The sump pump, pit and discharge piping shall conform to Sections 1113.1.1 through 1113.1.4.
The sump pump shall be of a capacity and head appropriate to anticipated use requirements.
The sump pit shall not be less than 18 inches (457 mm) in diameter and 24 inches (610 mm) deep, unless otherwise approved. The pit shall be accessible and located such that all drainage flows into the pit by gravity. The sump pit shall be constructed of tile, steel, plastic, cast-iron, concrete or other approved material, with a removable cover adequate to support anticipated loads in the area of use. The pit floor shall be solid and provide permanent support for the pump.
Electrical service outlets, when required, shall meet the requirements of the New York city electrical code.
Discharge piping shall meet the requirements of Section 1102.2, 1102.3 or 1102.4 and shall include a gate valve and a full flow check valve. Pipe and fittings shall be the same size as, or larger than, pump discharge tapping.
  Exception: In one- and two-family dwellings, only a check valve shall be required, located on the discharge piping from the pump or ejector.
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