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- 68-7.01B Definitions Reserved 68-7.01C Submittals
- 68-7.01D Quality Assurance
- 68-7.02E Treated Permeable Base
- 68-7.04 PAYMENT Not Used 68-8–68-15 RESERVED 69 OVERSIDE DRAINS 69-1 GENERAL 69-1.01 GENERAL
- 69-1.01D Quality Assurance
- 69-1.02B Steel Pipe Overside Drains
- 69-1.02C Aluminum Pipe Overside Drains
- 69-1.02D Plastic Pipe Overside Drains
- 69-1.02E Anchor Assemblies
- 69-1.02F Cable Anchorage System
- 69-1.02G Protective Coatings
68-4.04 PAYMENTThe payment quantity for edge drain is the length measured along the centerline of the pipe with no deductions for gaps in edge drain pipe at outlets and vents. The payment quantity for edge drain outlet is the length measured along the centerline of the pipe. 68-5 PERMEABLE MATERIAL BLANKET Reserved
68-6 RESERVED Reserved
68-7 GEOCOMPOSITE DRAIN SYSTEMS 68-7.01 GENERAL68-7.01A SummarySection 68-7 includes specifications for constructing geocomposite drain systems. Geocomposite drain includes filter fabric and plastic pipe. 68-7.01B DefinitionsReserved 68-7.01C SubmittalsSubmit a certificate of compliance for the geocomposite drain certifying that the drain produces the specified flow rate. The certificate must be accompanied by a flow capability graph for the geocomposite drain showing flow rates and the externally applied pressures and hydraulic gradients. Include verification by an authorized laboratory for the flow capability graph. 68-7.01D Quality AssuranceReserved 68-7.02 MATERIALS68-7.02A GeneralFilter fabric must be Class A. 68-7.02B Geocomposite DrainGeocomposite drain must comply with the specifications for geocomposite wall drain. 68-7.02C Plastic PipePlastic pipe must comply with the specifications for pipe for edge drains and edge drain outlets in section 68-4. 68-7.02D Drainage PadsDrainage pads must be constructed of minor concrete. 68-7.02E Treated Permeable BaseTreated permeable base to be placed around slotted plastic pipe at the bottom of geocomposite drains must comply with section 29. If asphalt treated permeable base is used, place the base material at a temperature of not less than 180 degrees F or more than 230 degrees F. 68-7.03 CONSTRUCTIONInstall the geocomposite drain with the drainage void and the filter fabric facing the embankment. The fabric facing the embankment side must overlap at least 3 inches at all joints and wrap around the exterior edges at least 3 inches beyond the exterior edge. If additional fabric is needed to provide overlap at joints and wraparound at edges, the added fabric must overlap at least 6 inches and be attached to the fabric on the geocomposite drain. Place core material manufactured from impermeable plastic sheeting having nonconnecting corrugations with the corrugations approximately perpendicular to the drainage collection system. If the fabric on the geocomposite drain is torn or punctured, replace the damaged section completely or repair it by placing a piece of fabric that is large enough to cover the damaged area and provide at least a 6-inch overlap.
68-7.04 PAYMENTNot Used 68-8–68-15 RESERVED 69 OVERSIDE DRAINS 69-1 GENERAL 69-1.01 GENERAL69-1.01A SummarySection 69 includes specifications for constructing overside drains. Excavation and backfill must comply with section 19-3. 69-1.01B DefinitionsReserved 69-1.01C SubmittalsSubmit a certificate of compliance for each of the following materials: 1. Steel
2. Aluminum 3. Plastic 69-1.01D Quality AssuranceJoints for overside drains must comply with section 61-2.01D(2)(a) for watertightness. 69-1.02 MATERIALS69-1.02A GeneralFor alternative pipe downdrain, choose 1 of the types shown. Fabrication of overside drain materials must comply with the details and dimensions shown. If authorized, minor variations may be used to allow the use of the manufacturer's standard jigs and templates during the fabrication. The material thickness must be not less than the thickness described. For pipe downdrains under concrete slope paving, the end of the downdrain must consist of steel pipe or steel conduit. Do not mix steel and aluminum pipe in the same installation. You may use the anchor assemblies shown with an aluminum installation if the anchor assemblies are electrically insulated. Plastic pipe and fittings used for overside drains must be from 1 manufacturer for each installation. Welding workmanship and techniques must be equal to the best practice in modern commercial shops. 69-1.02B Steel Pipe Overside DrainsSteel entrance tapers, pipe downdrains, reducers, coupling bands, and slip joints must be fabricated from galvanized steel sheets and must comply with AASHTO M 36 and section 66. The nominal thickness of the sheet must be at least 0.064 inch. The pipe must be Type I pipe under AASHTO M 36. Steel tapered inlets and flume downdrains must be fabricated from steel sheets under section 69-1.02B. Coupling bands for corrugated steel pipe must comply with either section 69-1.02B or section 61-2.01D(2)(b) for downdrain pipe. The weight of galvanizing for overside drain materials must comply with ASTM A123/A123M and A153/A153M. Galvanized surfaces on overside drain materials that are damaged must be repaired under section 75-1.02B.
Aluminum tapered inlets and flume downdrains must be fabricated of aluminum sheet complying with AASHTO M 197 with a thickness of at least 0.060 inch. Coupling bands for corrugated aluminum pipe must comply with either section 69-1.02C or section 61-2.01D(2)(b) for downdrain pipe.
Plastic pipe joints must comply with section 61-2.01D(2)(b). If pipe joint details are shown, the tensile strength requirements do not apply. The joint overlap requirements for integral joints must comply with the requirements for positive joints. 69-1.02E Anchor AssembliesA single anchor assembly includes: 1. 2 pipe stakes with necessary hardware 2. Bars or coupling bands 3. Hardware for fastening downdrain pipe or flume downdrain. Pipe stakes, plates, bars, clip brackets, and hardware must be hot-dip galvanized after fabrication under section 75-1.02B. 69-1.02F Cable Anchorage SystemCable anchorage systems for pipe downdrains must comply with section 69-1.02E. Cables, welded steel eyes, steel rods, turnbuckles, thimbles, cable clamps, and anchor plates must comply with specifications for similar materials in section 83-1.02B. Steel pipe must comply with specifications for pipe posts in section 56-2.02F. Concrete for concrete anchors must comply with the specifications for minor concrete except the concrete must contain at least 420 pounds of cementitious material per cubic yard. 69-1.02G Protective CoatingsIf described as coated, metal overside drains must be protected with coating under section 66-1.02C. If a protective coating is applied to a metal overside drain, each section of the downdrain pipe and each accessory must have the nominal thickness of the metal clearly identified on the inner surface with paint or other authorized means. Repair damaged coatings under section 66-1.02C.
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