Division 7 Drainage Structures, Storm Sewers, Sanitary .
Division 7Drainage Structures, Storm Sewers,Sanitary Sewers, Water Mains, and Conduits7-01Drains7-01.1DescriptionThis Work consists of constructing drain pipe and underdrain pipe in accordance with thePlans, these Specifications and Standard Plans, at the locations staked.7-01.2MaterialsMaterials shall meet the requirements of the following sections:Gravel Backfill for DrainsConcrete Drain PipeZinc Coated (Galvanized) or Aluminum Coated (Aluminized)Corrugated Iron or Steel Drain PipeCorrugated Aluminum Alloy Drain PipePolyvinyl Chloride (PVC) Drain Pipe, Couplings and FittingsCorrugated Polyethylene (PE) Drain Pipe, Couplings and Fittings(up to 10 inch)Corrugated Polyethylene (PE) Drain Pipe, Couplings and Fittings(12 through 60 inch)Perforated Concrete Underdrain PipeZinc Coated (Galvanized) or Aluminum Coated (Aluminized)Corrugated Iron or Steel Underdrain PipePerforated Corrugated Aluminum Alloy Underdrain PipePerforated Polyvinyl Chloride (PVC) Underdrain Pipe,8-inch diameter maximumPerforated Corrugated Polyethylene (PE) Underdrain Pipe(up to 10 inch)Perforated Corrugated Polyethylene (PE) Underdrain Pipe(12 through 60 .2(6)9-05.2(7)9-05.2(8)Drain pipes may be concrete, zinc coated (galvanized) corrugated iron, aluminum coated(aluminized) corrugated iron, zinc coated (galvanized) steel, aluminum coated (aluminized)steel, corrugated aluminum alloy, polyvinyl chloride (PVC), or corrugated polyethylene(PE) at the option of the Contractor unless the Plans specify the type to be used.Underdrain pipe, other than AASHTO M36 Type III Class IV, shall be perforated. They maybe concrete, bituminized fiber, zinc coated (galvanized) corrugated iron, aluminum coated(aluminized) corrugated iron, zinc coated (galvanized) steel, aluminum coated (aluminized)steel, corrugated aluminum alloy, polyvinyl chloride (PVC), or corrugated polyethylene(PE) at the option of the Contractor unless the Plans specify the type to be used.It is not necessary that all drain or underdrain pipes on any one project be of the samekind of material; however, all contiguous pipe shall be of the same kind.2021 Standard SpecificationsM 41-10Page 7-1
7-017-01.3DrainsConstruction RequirementsA trench of the dimensions shown in the Plans or as specified by the Engineer shall beexcavated to the grade and line given by the Engineer.7-01.3(1)Drain PipeDrain pipe shall be laid in conformity with the line and grades as shown in the Plans. Thedrain pipe shall be laid with soiltight joints unless otherwise specified. Concrete drain pipeshall be laid with the bell or larger end upstream. PVC drain pipe shall be jointed with abell and spigot joint using a flexible elastomeric seal as described in Section 9-04.8. Thebell shall be laid upstream. PE drain pipe shall be jointed with snap-on, screw-on, belland spigot, or wraparound coupling bands as recommended by the manufacturer of thetubing.7-01.3(2)Underdrain PipeWhen underdrain pipe is being installed as a means of intercepting ground or surfacewater, the trench shall be fine-graded in the existing soil 3 inches below the grade of thepipe as shown in the Plans. Gravel backfill shall be used under the pipe. Gravel backfillshall be placed to the depth shown in the Plans or as designated by the Engineer. Allbackfill shall be placed in 12-inch maximum layers and be thoroughly compacted withthree passes of a vibratory compactor for each layer. The Contractor shall use care inplacing the gravel backfill material to prevent its contamination.Class 2 perforations shall be used unless otherwise specified. When Class 1 perforationsare specified the perforated pipe shall be laid with the perforations down. Upon finalacceptance of the Work, all drain pipes shall be open, clean, and free draining. Perforatedpipe does not require a watertight joint. PVC underdrain pipe shall be jointed usingeither the flexible elastomeric seal as described in Section 9-04.8 or solvent cement asdescribed in Section 9-04.9, at the option of the Contractor unless otherwise specifiedin the Plans. The bell shall be laid upstream. PE drainage tubing underdrain pipe shallbe jointed with snap-on, screw-on, bell and spigot, or wraparound coupling bands, asrecommended by the manufacturer of the tubing.7-01.4MeasurementThe length of drain or underdrain pipe will be the number of linear feet of completedinstallation measured along the invert. Pipe placed in excess of the length designated bythe Engineer will not be measured or paid for.Excavation of the trench will be measured as Structure excavation Class B or Structureexcavation Class B including haul by the cubic yard as specified in Section 2-09.Gravel backfill for drains will be measured by the volume placed within the neatline limitsof Structure excavation Class B.Page 7-22021 Standard Specifications M 41-10
Drains7-01.57-01PaymentPayment will be made for each of the following Bid items that are included in theProposal:“Drain Pipe In. Diam.”, per linear foot.“Underdrain Pipe In. Diam.”, per linear foot.“Gravel Backfill for Drain”, per cubic yard.“Structure Excavation Class B”, per cubic yard.“Structure Excavation Class B Incl. Haul”, per cubic yard.2021 Standard SpecificationsM 41-10Page 7-3
7-02Culverts7-02Culvert Pipe7-02.1DescriptionThis Work consists of constructing culvert pipes of the various types and classesin accordance with the Plans, these Specifications, and the Standard Plans, at thelocations staked.Culvert pipes may be used for transverse drains under the Roadway or as conduits forwater pipe or other utilities passing under the Roadway.7-02.2MaterialsMaterials shall meet the requirements of the following sections:CementAggregates for ConcreteGravel Backfill for Pipe Zone BeddingButyl Rubber SealantExternal Sealing BandPlain Concrete Culvert PipeReinforced Concrete Culvert PipeBeveled Concrete End SectionsSteel Culvert Pipe and Pipe ArchSteel Nestable Pipe and Pipe ArchSteel End SectionsAluminum Culvert PipeAluminum End SectionsSolid Wall PVC Culvert PipeProfile Wall PVC Culvert PipeCorrugated Polyethylene Culvert PipeSteel Rib Reinforced Polyethylene Culvert PipeHigh-Density Polyethylene (HDPE) PipePolypropylene Culvert PipeSteel Reinforcing BarEpoxy-Coated Steel Reinforcing BarWelded Wire ReinforcementDeformed WireCold Drawn WireGroutMortarConcrete Curing Materials and AdmixturesPage 2021 Standard Specifications M 41-10
Culverts7-02Where steel or aluminum are referred to in this section in regard to a kind of culvert pipe,pipe arch, or end sections, it shall be understood that steel is zinc coated (galvanized)or aluminum coated (aluminized) corrugated iron or steel, and aluminum is corrugatedaluminum alloy as specified in Sections 9-05.4 and 9-05.5.Thermoplastic culvert pipe includes solid wall PVC culvert pipe, profile wall PVC culvertpipe, corrugated polyethylene culvert pipe, and polypropylene culvert pipe.It is not necessary that all culvert pipe on any one project be of the same kind of material.However, all contiguous pipe shall be of the same size, material, thickness, class, andtreatment and shall be that required for the maximum height of cover.Measurement for payment of the Bid items associated with the drainage installation willbe based on the diameter of the culvert pipe described by the Bid item in the Proposal.When schedule A, B, C, or D culvert pipe is specified in the Plans, the Contractor shallprovide the specified schedule and diameter but has the option of furnishing any of theacceptable materials shown in the Culvert Pipe Schedules Table.The use of tongue and groove concrete pipe shall only be allowed under side roadconnections. All tongue and groove pipe shall be joined with cement mortar.Culvert Pipe SchedulesSchedule(Fill Height)A2′ - 15′B15′ - 25′C25′ - 40′D40′ - 60′Diameterin inchesConcreteSteel 2⅔″ ½″Aluminum2⅔″ ½″ThermoplasticPE1, PVC2, or PP312, 18, 24Class III.064″ (16 Ga.).060″ (16 Ga.)PE, PVC, or PP30, 36Class III.064″ (16 Ga.).075″ (14 Ga.)PE, PVC, or PP42, 48Class III.064″ (16 Ga.).105″ (12 Ga.)PE, PVC, or PP12, 18, 24Class V.064″ (16 Ga.).060″ (16 Ga.)PE, PVC, or PP30, 36Class IV.064″ (16 Ga.).075″ (14 Ga.)PE, PVC, or PP42, 48Class IV.064″ (16 Ga.).105″ (12 Ga.)PE, PVC, or PP12, 18, 24Class V.064″ (16 Ga.).060″ (16 Ga.)None30, 36Class V.064″ (16 Ga.).075″ (14 Ga.)None42, 48Class V.064″ (16 Ga.).105″ (12 Ga.)None12, 18None.064″ (16 Ga.).060″ (16 Ga.)None24None.064″ (16 Ga.).075″ (14 Ga.)None30, 36None.064″ (16 Ga.).105″ (12 Ga.)None42, 48None.079″ (14 Ga.).135″ (10 Ga.)None1Corrugatedpolyethylene pipe.chloride pipe. Solid wall or profile wall for diameters through 27 inches Profile wall for diameterslarger than 27 inches.3Polypropylene pipe, 12 inch to 30 inch diameters approved for Schedule A and Schedule B, and 36 inch to60 inch diameters approved for Schedule A only.2Polyvinyl2021 Standard SpecificationsM 41-10Page 7-5
7-027-02.3CulvertsConstruction RequirementsCulvert pipes shall be constructed in accordance with Section 7-08.3.7-02.3(1)Placing Culvert Pipe – GeneralA dike or plug of impervious material shall be placed near the intake end of the culvertpipe to prevent piping. The dike shall be 2 feet long and adequately surround the pipe toform an impervious barrier. When suitable impervious materials are not available at thesite, suitable backfill shall be obtained as provided in Section 2-09.3(1)E.The ends of the pipe or pipe arch shall be rigidly supported to prevent movement beforeand during the construction of end walls or headers.Culvert pipes shall not be left extending beyond the staked limits unless approved by theEngineer.All thermoplastic pipe shall be beveled to match the embankment or ditch slope but shallnot be beveled flatter than 4:1. The minimum length of each section of pipe that is to bebeveled shall be at least six times the diameter of the pipe when measured from the toeof the bevel to the joint.7-02.3(2)Installation of Metal End SectionsMetal end sections shall be installed in accordance with the requirements of the StandardPlans, the Plans, and applicable portions of these Specifications.When flared metal end sections are installed on concrete pipe, Design B end sections willbe used on the inlet end only. Design C end sections will be used on the outlet ends onlyaccording to the following schedule:Page 7-6Concrete Pipe NominalDia. in inchesEnd Section NominalDia. in 2021 Standard Specifications M 41-10
Culverts7-02.3(3)7-02HeadwallsIf headwalls are specified in the Plans, they shall be constructed as soon as theembankment has been completed to a sufficient height over the Structure to allow therequired Work. Headwalls shall be constructed in accordance with applicable portions ofSection 6-02.7-02.3(4)Removing and Relaying Culvert PipesWhere shown in the Plans or where designated by the Engineer, existing culvert pipesshall be removed and relaid in accordance with these Specifications. Any culvert pipedamaged by the Contractor’s operations shall be replaced by the Contractor at noexpense to the Contracting Agency. In the case of concrete pipe, all joints of the pipebefore being relaid shall be cleaned so as to be free from all adhering material, includingold mortar placed as a collar or seal in the original construction.All culvert pipe sections removed and not relaid shall become the property of theContractor.7-02.3(5)Safety Bars for Culvert PipeWhen shown in the Plans, safety bars for culvert pipe shall be constructed in accordancewith the Standard Plans and shall meet the requirements of Section 9-05.18.7-02.4MeasurementThe length of culvert pipe or pipe arch will be the number of linear feet of completedinstallation measured along the invert. Pipe placed in excess of the length designated bythe Engineer will not be measured or paid for.Beveled end sections will be considered as part of the culvert pipe and shall be measuredas culvert pipes.Flared steel and aluminum end sections will be measured by the number of integral unitsof the dimension specified including toe plate extensions if called for in the Plans.The pipe connector section of end section Design A shall be fabricated as a part of theintegral unit of the end section but will be measured as linear feet of pipe or pipe arch ofthe treatment, thickness and dimensions of pipe to which it is attached. If there is no Biditem for pipe of the proper dimensions for the end sections, the pipe connector sectionswill be considered as part of the integral unit and will not be measured as pipe.Pipe connector sections of end section Design B will be considered part of the integralunit and measurement will be by number of integral units of the type and dimensionspecified.The length of safety bars for culvert pipe will be the number of linear feet of each safetybar installed.Tapered end section with safety bars will be measured by the unit per each.2021 Standard SpecificationsM 41-10Page 7-7
7-027-02.5CulvertsPaymentPayment will be made for each of the following Bid items that are included in theProposal:“Schedule Culv. Pipe In. Diam.”, per linear foot.“Plain Conc. Culv. Pipe In. Diam.”, per linear feet.“Cl. Reinf. Conc. Culv. Pipe In. Diam.”, per linear foot.“Plain St. Culv. Pipe In. Th. In. Diam.”, per linear foot.“Tr. St. Culv. Pipe In. Th. In. Diam.”, per linear foot.“Plain St. Culv. Pipe Arch In. Th. In. Span”, per linear foot.“Tr. St. Culv. Pipe Arch In. Th. In. Span”, per linear foot.“Plain Nestable St. Pipe In. Th. In. Diam.”, per linear foot.“Tr. Nestable St. Pipe In. Th. In. Diam.”, per linear foot.“Plain Al. Culv. Pipe In. Th. In. Diam.”, per linear foot.“Plain Al. Culv. Pipe Arch In. Th. In. Span”, per linear foot.“Relaying (type of Pipe and Size)”, per linear foot.“Solid Wall PVC Culv. Pipe In. Diam.”, per linear foot.“Profile Wall PVC Culv. Pipe In. Diam.”, per linear foot.“Corrugated Polyethylene Culv. Pipe In. Diam.”, per linear foot.“St. Rib Reinf Polyethylene Culv. Pipe In. Diam.”, per linear foot.“High-Density Polyethylene (HDPE) Pipe In. Diam.”, per linear foot.“Polypropylene Culvert Pipe In. Diam.”, per linear foot.Where culvert pipes are to be removed but are not to be relaid, all costs inconnection with the removal shall be included in the unit Contract price per cubicyard for “Structure Excavation Class B” or “Structure Excavation Class B Incl. Haul”.“Flared End Section In. Diam.”, per each.“Flared End Section In. Span”, per each.“Safety Bars for Culvert Pipe Type ”, per linear foot.“Tapered End Sect. with Type Safety Bars In. Diam.”, per each.Page 7-82021 Standard Specifications M 41-10
Structural Plate Pipe, Pipe Arch, Arch, and Underpass7-037-03Vacant2021 Standard SpecificationsM 41-10Page 7-9
7-04Storm Sewers7-04Storm Sewers7-04.1DescriptionThis Work consists of constructing storm sewer lines in accordance with the Plans, theseSpecifications, and the Standard Plans, as staked.7-04.2MaterialsMaterials shall meet the requirements of the following sections:Plain Concrete Storm Sewer PipeReinforced Concrete Storm Sewer PipeSteel Spiral Rib Storm Sewer PipeSteel Storm Sewer PipeAluminum Storm Sewer PipeSolid Wall PVC Storm Sewer PipeProfile Wall PVC Storm Sewer PipeAluminum Spiral Rib Storm Sewer PipeCorrugated Polyethylene Storm Sewer PipeSteel Rib Reinforced Polyethylene Storm Sewer PipeHigh-Density Polyethylene (HDPE) PipePolypropylene Storm Sewer re steel or aluminum are referred to in this section in regard to a kind of storm sewerpipe, it shall be understood that steel is zinc coated (galvanized) or aluminum coated(aluminized) corrugated iron or steel and aluminum is corrugated aluminum alloy asspecified in Sections 9-05.4 and 9-05.5.Thermoplastic storm sewer pipe includes solid wall PVC storm sewer pipe, profile wallPVC storm sewer pipe, corrugated polyethylene storm sewer pipe, and polypropylenestorm sewer pipe.Measurement for payment of the Bid items associated with the storm sewer installationwill be based on the diameter of the storm sewer pipe described by the Bid item in thePlans.It is not necessary that all storm sewer pipe on any one project be of the same kind ofmaterial. However, all contiguous pipe shall be of the same size, material, thickness, class,and treatment and shall be that required for the maximum height of cover.When schedule A or B storm sewer pipe is specified in the Plans, the Contractor shallprovide the specified schedule and diameter but has the option of furnishing any of theacceptable materials shown in the Storm Sewer Pipe Schedules Table.7-04.3Construction RequirementsStorm sewers shall be constructed in accordance with Section 7-08.3.Page 7-102021 Standard Specifications M 41-10
Storm Sewers7-04.3(1)7-04Cleaning and Testing7-04.3(1)AGeneralThe requirements of Section 7-17.3(2)A shall apply to storm sewers.7-04.3(1)BExfiltration Test – Storm SewersPrior to making exfiltration leakage tests, the Contractor may fill the pipe with clear waterto permit normal absorption into the pipe walls.Leakage shall be no more than 1 gallon per hour per inch of diameter per 100 feet ofstorm sewer pipe, with a minimum test pressure of 6 feet of water column above thecrown at the upper end of the pipe or above the active ground water table, whichever ishigher as determined by the Engineer. The length of pipe tested shall be limited so thatthe pressure on the invert of the lower end of the Section tested shall not exceed 16 feetof water column. For each increase in pressure of 2 feet above a basic 6 feet measuredabove the crown at the lower end of the test section, the allowable leakage shall beincreased by 10 percent.Storm Sewer Pipe SchedulesAluminum2⅔″ ½″ Corr.Schedules Dia.(Fill Ht.) (In.)ConcretePVC1PE2PP4Steel32⅔″ ½″or Spiral Rib Tr. 5 Plain WithGasketedSeamsSpiral Rib Tr. 5 Plain WithGasketedSeams12 Plain or Cl. IV SW or PW Allowed 0.064″ (16 Ga.) 0.060″ (16 Ga.) 0.060″ (16 Ga.)18 Plain or Cl. IV SW or PW Allowed 0.064″ (16 Ga.) 0.060″ (16 Ga.) 0.060″ (16 Ga.)A2′ 15′B15′ 25′24 Plain or Cl. IV SW or PW Allowed 0.064″ (16 Ga.) 0.060″ (16 Ga.) 0.060″ (16 Ga.)30Class IIIPWAllowed 0.064″ (16 Ga.) 0.075″ (14 Ga.) 0.060″ (16 Ga.)36Class IIIPWAllowed 0.064″ (16 Ga.) 0.075″ (14 Ga.) 0.060″ (16 Ga.)42Class IIIPWAllowed 0.064″ (16 Ga.) 0.105″ (12 Ga.) 0.075″ (14 Ga.)48Class IIIPWAllowed 0.064″ (16 Ga.) 0.105″ (12 Ga.) 0.075″ (14 Ga.)12Class VSW or PW Allowed 0.064″ (16 Ga.) 0.060″ (16 Ga.) 0.060″ (16 Ga.)18Class VSW or PW Allowed 0.064″ (16 Ga.) 0.060″ (16 Ga.) 0.060″ (16 Ga.)24Class VSW or PW Allowed 0.064″ (16 Ga.) 0.060″ (16 Ga.) 0.060″ (16 Ga.)30Class VPWAllowed 0.064″ (16 Ga.) 0.075″ (14 Ga.) 0.075″ (14 Ga.)36Class VPWAllowed 0.064″ (16 Ga.) 0.075″ (14 Ga.) 0.105″ (12 Ga.)42Class VPWAllowed 0.064″ (16 Ga.) 0.105″ (12 Ga.) 0.105″ (12 Ga.)48Class VPWAllowed 0.064″ (16 Ga.) 0.105″ (12 Ga.) 0.105″ (12 Ga.)1PVC Polyvinyl Chloride Pipe, SW Solid Wall PVC, PW Profile Wall PVC Corrugated Polyethylene Pipe3Steel pipe options for either 2⅔″ ½″ corrugations or spiral rib include: Tr. 5 galvanized, Tr. 2 galvanized withgasketed seams, Tr. 5 aluminized, or plain aluminized with gasketed seams.4PP Polypropylene Pipe, 12 inch to 30 inch approved for Schedule A and Schedule B and 36 inch to 60 inchdiameters approved for Schedule A only.2PE2021 Standard SpecificationsM 41-10Page 7-11
7-04Storm Sewers7-04.3(1)CInfiltration Test – Storm SewersWhenever the gr
Division 7 Drainage Structures, Storm Sewers, Sanitary Sewers, Water Mains, and Conduits 7-01 Drains 7-01.1Description This Work consists of constructing drain pipe and underdrain pipe in accordance with the Plans, these Specifications and
Drainage Criteria Manual SECTION 5 - STORM DRAINS SECTION 5 - STORM DRAINS 5.1.0 GENERAL The purpose of this section is to consider the hydraulic aspects of storm drains and their appurtenances in a storm drainage system. Hydraulically, storm drainage systems consist of conduits (open or enclosed) in which unsteady and non-uniform flow exists.
4 Principles of Exterior Drainage — Quick Review Design options: Directional Drainage (left) Channel Drainage (right) B. Design Basic Drainage Design The three basic functions of any storm drainage system are to: 1. Collect water 2. Conduct or move water through pipes 3. Discharge of water. Checklist for Drainage Design Analyze the topography .
Drainage Design Manual; and, the Denver Regional Council of Governments, Urban Drainage and Flood Control District’s Urban Storm Drainage Criteria Manual. This chapter is not a textbook on drainage design, nor is it a substitute for fundamental engineering knowledge or experience in drainage design. Storm drains should be designed by the CDOT
storm drainage system in the City consists of more than 300 miles of storm drainpipes, over 100 miles of open creeks, and 15,000 structures (mostly inlets, manholes, and catch basins). These facilities are both publicly and privately owned. City-owned storm drainage facilities are typically located within easements and right-of-ways.
STANDARD SPECIFICATIONS DIVISION 1 General Requirements DIVISION 2 Earthwork DIVISION 3 Production From Quarry and Pit Sites and Stockpiling DIVISION 4 Bases DIVISION 5 Surface Treatments and Pavements DIVISION 6 Structures DIVISION 7 Drainage Structures, Storm Sewers, Sanitary Sewers, Water Mains, and Conduits DIVISION 8 Miscellaneous Construction
Drainage Services Department INTRODUCTION Drainage Master Planning for Land Drainage ·Flood Control in the Northern New Territories of Hong Kong Since the establishment of the Drainage Services Department in 1989, strategic studies have been carried out to develop a comprehensive land drainage and flood control
The legal aspects of highway drainage are discussed at greater length in "The Legal Aspects of Highway Drainage" (Chapter 5 of the "Highway Drainage Guidelines") and "Legal Aspects" (Chapter 2 of the "Model Drainage Manual"). 8.2.1 State Drainage Law State drainage law is derived from common law based on two historical lines of thought: the old
drainage program relates to the collection and safe disposal of storm water runoff generated within the urban and rural watersheds or drainage areas. Collectively, these facilities comprise the Storm Drainage and Flood Control Master Plan. The local storm water retention basin system is designed to: 1) capture storm water during the rainy season to
