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SPS 382.35(3)(g)2. 2. A cleanout shall not be required for a branch drain when the fixtures on the branch include one floor outlet fixture and any fixtures discharging into an accompanying wet vent.
SPS 382.35(3)(h) (h) Greasy wastes. Drain pipes carrying greasy wastes shall be provided with cleanouts located not more than 40 feet apart and at all changes in direction of more than 45°.
SPS 382.35(3)(i) (i) Double sanitary tees. A cleanout shall be provided immediately above or below a double sanitary tee drain fitting which is installed in a vertical drain pipe of less than 3" in diameter, unless a stack cleanout is provided in accordance with par. (f).
SPS 382.35(3)(j) (j) Traps and fixture drains.
SPS 382.35(3)(j)1.1. All traps shall be constructed or installed so that stoppages may be removed from the traps and the horizontal portions of fixture drains.
SPS 382.35(3)(j)2. 2. If a trap is not accessible for removal or does not contain a removable dip, a cleanout or a removable inlet shall be installed to enable cleaning of the trap passageway and the horizontal portions of the fixture drain.
SPS 382.35(3)(k) (k) Conductors. Where a cleanout is provided in a conductor, the cleanout shall be located 28 to 60" above the lowest floor penetrated by the conductor.
SPS 382.35(3)(L) (L) Sampling manholes. Municipalities or sanitary sewage districts by ordinance or rule may require the installation of sampling manholes for periodic sewage monitoring.
SPS 382.35 Note Note: The installation of sampling manholes may be needed for the monitoring of industrial wastes under chs. NR 200 to 299. See ch. SPS 382 Appendix for further explanatory material.
SPS 382.35(3)(m) (m) Catch basins and interceptors. The fixture drain from all interceptors designed in accordance with s. SPS 382.34 (4) (a) 2. shall be provided with an accessible cleanout located outside of the basin and not more than 15 inches from the weir of the trap.
SPS 382.35(4) (4)Direction of flow. Every cleanout shall be installed so as to open in the direction of the waste flow or at a right angle thereto.
SPS 382.35(5) (5)Accessibility. Cleanout plugs shall not be covered with cement, plaster, or any other similar permanent finishing material.
SPS 382.35(5)(a) (a) Underground piping. Cleanouts installed in underground drain piping shall be extended vertically to or above the finish grade.
SPS 382.35(5)(a)1. 1. All interior and exterior cleanouts where the vertical distance between the horizontal drain pipe being served and the top of the cleanout opening exceeds 18 inches in length, shall connect to the drain piping through a fitting as specified in Table 382.30–4.
SPS 382.35(5)(a)2. 2. A cleanout located outside of a building shall be provided with a frost sleeve.
SPS 382.35(5)(a)2.a. a. The frost sleeve shall be of a material approved for building sewers in accordance with s. SPS 384.30 (2) (c).
SPS 382.35(5)(a)2.b. b. Where a cleanout is located in an area subject to vehicular traffic the top of the frost sleeve shall terminate in a concrete pad at least 4" thick and extending at least 9" from the sleeve on all sides, sloping away from the sleeve.
SPS 382.35(5)(a)2.c. c. The bottom of the frost sleeve shall terminate 6" to 12" above the top of the drain piping or at least 6" below the predicted frost depth in accordance with s. SPS 382.30 Table 382.30-6.
SPS 382.35(5)(a)2.d. d. The frost sleeve shall have a removable watertight top of sufficient thickness and strength to sustain the weight of anticipated traffic.
SPS 382.35 Note Note: See ch. SPS 382 Appendix for further explanatory material.
SPS 382.35(5)(b) (b) Concealed piping. Cleanout access for drain piping located in concealed spaces shall be provided by either extending the cleanout to at least the surface of a wall or floor or by providing access panels of a sufficient size to permit removal of the cleanout plug and proper cleaning of the pipe.
SPS 382.35(6) (6)Cleanout size. Cleanouts and cleanout extensions shall be sized in accordance with Table 382.35. - See PDF for table PDF
SPS 382.35(7) (7)Prohibited use of cleanout openings. Cleanout openings shall not be used for the installation of fixtures or floor drains, except where another cleanout of equal access and capacity is provided.
SPS 382.35(8) (8)Manholes.
SPS 382.35(8)(a)(a) Diameter. The minimum diameter of manholes shall be 42. A manhole shall have a minimum access opening of 24.
SPS 382.35(8)(b) (b) Materials. Manholes shall be constructed of approved materials in accordance with ch. SPS 384 and in accordance with the design provisions of s. NR 110.13.
SPS 382.35 Note Note: The provisions of s. NR 110.13 regarding the manhole's flow channel, watertightness, and drop pipe indicate the following specifications:
SPS 382.35 Note —The flow channel through manholes shall be made to conform to the shape and slope of the sewer.
SPS 382.35 Note —Solid watertight manhole covers are to be used wherever the manhole tops may be flooded by street runoff or high water. Where groundwater conditions are unfavorable, manholes of brick or block shall be waterproofed on the exterior with plastic coatings supplemented by a bituminous waterproof coating or other approved coatings. Inlet and outlet pipes are to be joined to the manhole with a gasketed flexible watertight connection or any watertight connection arrangement that allows differential settlement of the pipe and manhole wall to take place.
SPS 382.35 Note —An outside drop pipe is to be provided for a sewer entering a manhole where the invert elevation of the entering sewer is 2 feet or more above the spring line of the outgoing sewer. The entire drop connection shall be encased in the concrete. Inside drop connection may be approved on a case-by-case basis.
SPS 382.35 Note Note: See ch. SPS 382 Appendix for further explanatory material.
SPS 382.35 History History: Cr. Register, February, 1985, No. 350, eff. 3-1-85; am. (3) (i), r. and recr. (3) (j), Register, May, 1988, No. 389, eff. 6-1-88; am. (5) (a) 2. a., Register, August, 1991, No. 428, eff. 9-1-91; r. and recr. (3) (j) and (5) (a) 2. c., Register, February, 1994, No. 458, eff. 3-1-94; CR 02-002: am. (3) (a) and (d) 1. (intro.), renum. (3) (g) to be (3) (g) 1. and am., cr. (3) (g) 2. and (m), r. and recr. (5) (a) 1. Register April 2003 No. 568, eff. 5-1-03; CR 08-055: r. and recr. (3) (a), am. (3) (b) 2. a., b., (c) 2. a., b., (d) 2. b., c., (5) (a) 1. and Table 82.35 Register February 2009 No. 638, eff. 3-1-09; correction in (2), (3) (m), (5) (a) 1., 2. a., c., (6), (8) (b) made under s. 13.92 (4) (b) 7., Stats., Register December 2011 No. 672.
SPS 382.36 SPS 382.36Stormwater and clearwater plumbing systems.
SPS 382.36(1)(1)Scope. The provisions of this section set forth the requirements for the design, installation and maintenance of piping, conveyance, venting, detention and treatment of stormwater and clearwater in plumbing systems.
SPS 382.36 Note Note: Refer to ch. NR 151 for stormwater management requirements.
SPS 382.36(2) (2)Materials. All stormwater and clearwater plumbing systems shall be constructed of approved materials in accordance with s. SPS 384.30 (3).
SPS 382.36(3) (3)Design of stormwater plumbing systems.
SPS 382.36(3)(a)(a) Plumbing systems upstream of detention shall be designed, at a minimum, based on the 10-year, 24-hour storm event.
SPS 382.36(3)(b) (b) Plumbing detention systems and plumbing systems located downstream of detention shall be designed based on anticipated flows and volumes.
SPS 382.36(3)(c) (c) Stormwater and clearwater infiltration systems shall comply with s. SPS 382.365.
SPS 382.36 Note Note: For a listing of best management practices (BMPs) refer to ch. SPS 382 Appendix A-382.36 (3)-1.
SPS 382.36 Note Note: Where local discharge requirements are more stringent, stormwater plumbing systems may provide detention and treatment to comply with the local stormwater management plan.
SPS 382.36(4) (4)Discharge, dispersal, clearwater reuse or stormwater use.
SPS 382.36(4)(a)(a) Discharge points. The discharge points for stormwater and clearwater shall be as specified in Table 382.38-1.
SPS 382.36(4)(b) (b) Segregation of wastewater.
SPS 382.36(4)(b)1.1. Except as provided in subd. 2., stormwater or clearwater piping may not connect to a sanitary drain system.
SPS 382.36(4)(b)2. 2. Where a combined sanitary-storm sewer system is available, stormwater, clearwater and sanitary wastewater may be combined in the building sewer.
SPS 382.36(4)(b)3. 3. Stormwater gravity drains shall not be combined with clearwater drains prior to discharging to the storm building drain except where approved by the department.
SPS 382.36 Note Note: See also Table SPS 382.38-1 which limits clearwater discharges to sanitary sewer at 50 gpd.
SPS 382.36 Note Note: For the use of stormwater or reuse of clearwater, refer to the appropriate requirements in ss. SPS 382.30, 382.34, 382.40, 382.41, 382.70 and this section.
SPS 382.36 Note Note: For further explanatory material regarding the rational method, other methods and runoff co-efficients, see ch. SPS 382 Appendix A-382.36 (4).
SPS 382.36(5) (5)Input calculations.
SPS 382.36(5)(a)(a) Peak flow. The peak flow of stormwater influent to a plumbing system shall be calculated using any of the following methods:
SPS 382.36(5)(a)1. 1. `Area method.' For sizing of conveyance piping, when calculating stormwater peak flow based on the tributary area, the area in square feet shall be divided by the following applicable divisors:
SPS 382.36(5)(a)1.a. a. For roofs the divisor is 26 square feet/gpm.
SPS 382.36(5)(a)1.b. b. For paved or graveled ground surfaces the divisor is 32.5 square feet/gpm.
SPS 382.36(5)(a)1.c. c. For lawns, parks and similar land surfaces the divisor is 104 square feet/gpm.
SPS 382.36 Note Note: For example, 10,000 square feet of roof area/26 square feet/gpm = 385 gpm or 0.85 cubic feet/second.
SPS 382.36(5)(a)2. 2. `Rational method.' For calculating peak flow, the intensity shall be determined using the time of concentration for the tributary area.
SPS 382.36 Note Note: For the equation procedure for runoff coefficients for use with the rational method, refer to ch. SPS 382 Appendix A-382.36 (5)-1.
SPS 382.36(5)(a)3. 3. `Engineering analysis method.' An engineering analysis, acceptable to the department, shall be based on the peak flow calculated in accordance with sub. (3) (a).
SPS 382.36 Note Note: A model that calculates peak flow such as SWMM, TR-20, TR-55, P8 or an equivalent methodology may be used.
SPS 382.36(5)(b) (b) Volume. The volume of stormwater influent to a plumbing system shall be based on an engineering design acceptable to the department and a minimum of a two-year, 24-hour storm event and designed so that no property damage occurs at 100-year, 24-hour storm event with a Type II distribution.
SPS 382.36 Note Note: For runoff coefficients and use of other methods or models, refer to ch. SPS 382 Appendix A-382.36 (5)-2 and A-382.36 (5)-3.
SPS 382.36 Note Note: The intensity of rainfall varies considerably during a storm as well as geographic regions. To represent various regions of the United States, the U.S. Department of Agriculture (USDA), Natural Resources Conservation Service (NRCS) developed four synthetic 24-hour rainfall distribution types from available National Weather Service (NWS) duration-frequency data (Hershfield 1961; Frederick et al., 1977) or local storm data. Type IA is the least intense and type II is the most intense short duration rainfall. Types I and IA represent the Pacific maritime climate with wet winters and dry summers. Type III represents Gulf of Mexico and Atlantic coastal areas where tropical storms bring large 24-hour rainfall amounts. Type II represents the rest of the country, including Wisconsin. For more information, see the USDA-NRCS webpage:
SPS 382.36(5)(c) (c) Additional inputs to stormwater systems. Additional inputs to stormwater systems shall be estimated based on anticipated flows and volumes.
SPS 382.36(6) (6)Conveyance and detention systems.
SPS 382.36(6)(a)(a) Design. The design of stormwater and clearwater conveyance systems shall conform to all of the following:
SPS 382.36(6)(a)1. 1. Horizontal stormwater conveyance piping shall be sized using either of the following:
SPS 382.36(6)(a)1.a. a. An engineering analysis, based on full flow capacity, acceptable to the department.
SPS 382.36(6)(a)1.b. b. Tables 382.36-1 to 382.36-5 based on pipe type, diameter and pitch.
SPS 382.36(6)(a)2.a.a. A vertical conductor for stormwater may not be smaller than the largest horizontal branch discharging into the conductor.
SPS 382.36(6)(a)2.b. b. Vertical conductors shall be sized in accordance with Tables 382.36-1 and 382.36-3 or by an engineering analysis acceptable to the department.
SPS 382.36 Note Note: For the use of Baird's equation, refer to ch. SPS 382 Appendix A-382.36 (6)-1.
SPS 382.36(6)(a)3. 3. Clearwater conveyance systems shall be sized in accordance with s. SPS 382.30 (3) and (4).
SPS 382.36(6)(a)4. 4. Underground, gravity-flow storm building sewers shall have a minimum 3-inch inside diameter.
SPS 382.36(6)(b) (b) Velocity in stormwater conveyance system piping. The pitch of stormwater conveyance system piping shall be designed to create a minimum velocity of one foot per second when flowing full.
SPS 382.36(6)(c) (c) Fittings and connections.
SPS 382.36(6)(c)1.1. Except as provided in subd. 2., fittings and connections for stormwater and clearwater conveyance systems shall comply with s. SPS 382.30 (8) and (9).
SPS 382.36(6)(c)2. 2. The minimum radius for the first 90° fitting located downstream of a roof drain shall comply with the horizontal to vertical requirements in Table 382.30-4.
SPS 382.36(6)(d) (d) Stack offsets. Stack offsets for piping of a clearwater conveyance system piping shall comply with s. SPS 382.30 (6).
SPS 382.36(6)(e) (e) Pitch of clearwater gravity conveyance system piping.
SPS 382.36(6)(e)1.1. The minimum pitch of gravity conveyance system piping having a 2-inch inside diameter or less shall be 1/8 inch per foot.
SPS 382.36(6)(e)2. 2. The minimum pitch of clearwater gravity conveyance system piping having at least a 3-inch inside diameter or more shall be 1/16 inch per foot.
SPS 382.36(6)(f) (f) Branch connections near base of stack. Branch drains from interior clearwater inlets may not connect downstream from the base fitting or fittings of a drain stack within a distance equal to 20 pipe diameters of the building drain.
SPS 382.36(6)(g) (g) Detention systems.
SPS 382.36(6)(g)1.1. The storage volume of a dry detention system shall be designed and installed with a drain time of 72 hours after a storm event.
SPS 382.36(6)(g)2. 2. Paved surfaces or parking lots serving as detention areas shall be limited to a design depth of 6 inches, unless otherwise limited by local ordinance.
Published under s. 35.93, Stats. Updated on the first day of each month. Entire code is always current. The Register date on each page is the date the chapter was last published.