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Ohio Laws and Rules
[Comment: When a reference is made within this rule to a federal statutory provision, an industry consensus standard, or any other technical publication, the specific date and title of the publication as well as the name and address of the promulgating agency are listed in rule 4101:3-13-01 of the Administrative Code. The application of the referenced standards shall be limited and as prescribed in section 102.4 of rule 4101:1-1-01 of the Administrative Code.]
SECTION 1101 GENERAL
1101.1 Scope. The provisions of this chapter shall govern the materials, design, construction and installation of storm drainage.
1101.2 Where required. All roofs, paved areas, yards, courts and courtyards in buildings shall drain into a separate storm sewer system, or a combined sewer system, or to an approved place of disposal..
1101.3 Prohibited drainage. Storm water shall not be drained into sewers intended for sewage only.
1101.4 Tests. The conductors and the building storm drain shall be tested in accordance with Section 312.
1101.5 Change in size. The size of a drainage pipe shall not be reduced in the direction of flow.
1101.6 Fittings and connections. 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.
1101.7 Roof design. 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 drainage means shall be assumed to be blocked.
1101.8 Cleanouts required. 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.
1101.9 Backwater valves. Backwater valves installed in a storm drainage system shall conform to Section 715.
SECTION 1102 MATERIALS
1102.1 General. 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.
1102.2 Inside storm drainage conductors. Inside storm drainage conductors installed above ground shall conform to one of the standards listed in Table 702.1.
1102.3 Underground building storm drain pipe. Underground building storm drain pipe shall conform to one of the standards listed in Table 702.2.
1102.4 Building storm sewer pipe. 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
Acrylonitrile butadiene styrene (ABS) plastic pipe ASTM D 2661; ASTM D 2751; ASTM F 628; CSA B181.1; CSA B182.1
Asbestos-cement pipe ASTM C 428
Cast-iron pipe ASTM A 74; ASTM A 888; CISPI 301
Concrete pipe ASTM C 14; ASTM C 76; CSA A257.1M; CSA A257.2M
Copper or copper-alloy tubing (Type K, L, M or DWV) ASTM B 75; ASTM B 88; ASTM B 251; ASTM B 306
Polyvinyl chloride (PVC) plastic pipe (Type DWV, SDR26, SDR35, SDR41, PS50 or PS100) ASTM D 2665; ASTM D 3034; ASTM F 891; CSA B182.4; CSA B181.2; CSA B182.2
Vitrified clay pipe ASTM C 4; ASTM C 700
Stainless steel drainage systems, Type 316L ASME A112.3.1
1102.5 Subsoil drain pipe. 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
Asbestos-cement pipe ASTM C 508
Cast-iron pipe ASTM A 74; ASTM A 888; CISPI 301
Polyethylene (PE) plastic pipe ASTM F 405; CSA B182.1; CSA B182.6; CSA B182.8
Polyvinyl chloride (PVC) Plastic pipe (type sewer pipe, PS25, PS50 or PS100) ASTM D 2729; ASTM F 891; CSA B182.2; CSA B182.4
Stainless steel drainage systems, Type 316L ASME A112.3.1
Vitrified clay pipe ASTM C 4; ASTM C 700
1102.6 Roof drains. Roof drains shall conform to ASME A112.21.2M or ASME A112.3.1.
1102.7 Fittings. 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
SECTION 1103 TRAPS
MATERIAL STANDARD
Acrylonitrile butadiene styrene (ABS) plastic ASTM D 2661; ASTM D 3311; CSA B181.1
Cast-iron ASME B16.4; ASME B16.12; ASTM A 888; CISPI 301; ASTM A 74
Coextruded composite ABS sewer and drain DR-PS in PS35, PS50, PS100, PS140, PS200 ASTM D 2751
Coextruded composite ABS DWV Schedule 40 IPS pipe (solid or cellular core) ASTM D 2661; ASTM D 3311; ASTM F 628
Coextruded composite PVC DWV Schedule 40 IPS-DR, PS140, PS200 (solid or cellular core) ASTM D 2665; ASTM D 3311; ASTM F 891
Coextruded composite PVC sewer and drain DR-PS in PS35, PS50, PS100, PS140, PS200 ASTM D 3034
Copper or copper alloy ASME B16.15; ASME B16.18; ASME B16.22; ASME B16.23; ASME B16.26; ASME B16.29
Gray iron and ductile iron AWWA C110
Malleable iron ASME B16.3
Plastic, general ASTM F 409
Polyvinyl chloride (PVC) plastic ASTM D 2665; ASTM D 3311; ASTM F 1866
Steel ASME B16.9; ASME B16.11; ASME B16.28
Stainless steel drainage Systems, Type 316L ASME A112.3.2
1103.1 Main trap. 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.
1103.2 Material. Storm water traps shall be of the same material as the piping system to which they are attached.
1103.3 Size. Traps for individual conductors shall be the same size as the horizontal drain to which they are connected.
1103.4 Cleanout. An accessible cleanout shall be installed on the building side of the trap.
SECTION 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 Combining storm with sanitary drainage. The sanitary and storm drainage systems of a structure shall be entirely separate except where combined sewer systems are utilized. Where a combined sewer is utilized, the building storm drain shall be connected to the sanitary sewer exterior to the building.
1104.3 Floor drains. Floor drains shall not be connected to a storm drain.
SECTION 1105 ROOF DRAINS
1105.1 Strainers. 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.
1105.2 Flat decks. 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.
1105.3 Roof drain flashings. 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.
SECTION 1106 SIZE OF CONDUCTORS, LEADERS AND STORM DRAINS
1106.1 General. The size of the vertical conductors and leaders, 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 indicated in Figure
1106.1 or on other rainfall rates determined from approved local weather data.
1106.2 Vertical conductors and leaders. Vertical conductors and leaders shall be sized for the maximum projected roof area, in accordance with Table 1106.2.
1106.3 Building storm drains and sewers. 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.
1106.4 Vertical walls. 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.
1106.5 Parapet wall scupper location. Parapet wall roof drainage scupper and overflow scupper location shall comply with the requirements of the building code.
1106.6 Size of roof gutters. The size of semicircular gutters shall be based on the maximum projected roof area in accordance with Table 1106.6.
FIGURE 1106.1 100-YEAR, 1-HOUR RAINFALL
See Figure at http://www.registerofohio.state.oh.us/pdfs/4101/3/11/4101$3-11-01_PH_FF_N_RU_20070202_1325.pdf
TABLE 1106.2 SIZE OF VERTICAL CONDUCTORS AND LEADERS
See Table at http://www.registerofohio.state.oh.us/pdfs/4101/3/11/4101$3-11-01_PH_FF_N_RU_20070202_1325.pdf
TABLE 1106.3 SIZE OF HORIZONTAL STORM DRAINGE PIPING
See Table at http://www.registerofohio.state.oh.us/pdfs/4101/3/11/4101$3-11-01_PH_FF_N_RU_20070202_1325.pdf
SECTION 1107 SECONDARY (EMERGENCY) ROOF DRAINS
1107.1 Secondary drainage required. 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.
1107.2 Separate systems required. Secondary roof drain systems shall have the end point of discharge separate from the primary system. Discharge shall be above grade, in a location that would normally be observed by the building occupants or maintenance personnel.
TABLE 1106.6 SIZE OF SEMICIRCULAR ROOF GUTTERS
See Table at http://www.registerofohio.state.oh.us/pdfs/4101/3/11/4101$3-11-01_PH_FF_N_RU_20070202_1325.pdf
1107.3 Sizing of secondary drains. Secondary (emergency) roof drain systems shall be sized in accordance with Section 1106 based on the rainfall rate for which the primary system is sized in Tables 1106.2, 1106.3 and 1106.6. 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). The flow through the primary system shall not be considered when sizing the secondary roof drain system.
SECTION 1108 COMBINED SANITARY AND STORM SYSTEM
1108.1 Size of combined drains and sewers. Deleted.
SECTION 1109 VALUES FOR CONTINUOUS FLOW
1109.1 Equivalent roof area. 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 (L/m) of such discharge shall be computed as being equivalent to 96 square feet (9 m2) of roof area, based on a rainfall rate of 1 inch (25.4 mm) per hour.
SECTION 1110 CONTROLLED FLOW ROOF DRAIN SYSTEMS
1110.1 General. 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 the design, submittal, approval, inspection and testing requirements of Sections 106.6 and 106.7 of the building code and Section 312 of this code. The controlled flow system shall be designed based on the required rainfall rate in accordance with Section 1106.1.
1110.2 Control devices. 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.
1110.3 Installation. Runoff control shall be by control devices. Control devices shall be protected by strainers.
1110.4 Minimum number of roof drains. Not less than two roof drains shall be installed in roof areas 10,000 square feet (929 m2) or less and not less than four roof drains shall be installed in roofs over 10,000 square feet (929 m2) in area.
SECTION 1111 SUBSOIL DRAINS
1111.1 Subsoil drains. 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. Subsoil drains 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.
SECTION 1112 BUILDING SUBDRAINS
1112.1 Building subdrains. 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.
SECTION 1113 SUMPS AND PUMPING SYSTEMS
1113.1 Pumping system. The sump pump, pit and discharge piping shall conform to Sections 1113.1.1 through 1113.1.4.
1113.1.1 Pump capacity and head. The sump pump shall be of a capacity and head appropriate to anticipated use requirements.
1113.1.2 Sump pit. 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.
1113.1.3 Electrical. Deleted.
1113.1.4 Piping. Discharge piping shall meet the requirements of Section 1102.2, 1102.3 or 1102.4 and shall include a full open valve and a full flow check valve. Pipe and fittings shall be the same size as, or larger than, pump discharge tapping.
Exception: In buildings where the “Residential Code of Ohio” applies, only a check valve shall be required, located on the discharge piping from the pump or ejector.
Replaces: 4101:3-11-01.2, 4101:3-11-04.2, 4101:3-11-08.1, 4101:3-11-10.1, 4101:3-11-13.1.3, 4101:3-11-13.1.4
Effective: 07/01/2007
R.C. 119.032 review dates: 07/01/2012
Promulgated Under: 119.03
Statutory Authority: 3781.10(A)
Rule Amplifies: 3781.10, 3781.11, 3791.04
Prior Effective Dates: 3/1/98, 1/1/02
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