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Open the official NY source PDF ↗SECTION 605 – UNDERDRAINS AND EDGEDRAINS
605-1 DESCRIPTION. The work shall consist of constructing underdrain or edgedrain installations in
accordance with these specifications and in conformity with the lines, grades, and cross-sections shown in the contract documents.
605-2 Materials
605-2.01 Underdrain Pipe. Underdrain pipe shall meet the requirements of the following subsections of
Section 700 Materials and Manufacturing for the type of pipe specified in the contract documents: Corrugated Steel Pipe - Type III, 16 gage 707-02 Porous Concrete Pipe Underdrain 706-05 Extra Strength Porous Concrete Pipe Underdrain 706-05 Perforated Corrugated Polyethylene Underdrain Tubing 706-13 Corrugated Aluminum Pipe - Type III, 16 gage 707-13 Perforated Polyvinyl Chloride Underdrain Pipe 706-18 Optional underdrain pipe shall meet the requirements of any of the above at the Contractors option except that porous concrete pipe shall not be used in an edge of pavement underdrain installation.
605-2.02 Underdrain Filter. The requirements for Underdrain Filter materials are described below. The
procedure for acceptance or rejection of Underdrain Filter materials shall be in conformance with the procedures contained in the geotechnical control procedure “Procedure for the Control and Quality Assurance of Granular Materials”. Underdrain Filter material shall meet the requirements of the following subsections of Section 700 Materials and Manufacturing for the type of underdrain filter material specified in the contract documents:
A.Underdrain Filter Type I. Provide material meeting the requirements of §733-20 Underdrain Filter, Type 1.
B.Underdrain Filter Type II. Provide material meeting the requirements of §733-20 Underdrain Filter, Type 2.
C.Underdrain Filter Type III. Provide material meeting the requirements of §733-20 Underdrain Filter, Type 3.
605-3 Construction Details
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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 600 STANDARD SPECIFICATIONS (USC) January 1, 2026 VOLUME 3
605-3.01 Underdrain Pipe. Install the underdrain pipe in accordance with Standard Sheet 605-02
Edgedrain and Lateral Outlet Details and the construction details of Section 603 Culverts and Storm Drains shall apply. The type of filter material to be used at any location will be as shown in the contract documents. A carefully leveled and compacted bed of this material shall be prepared just prior to the placement of the underdrain pipe. The uphill end of an edgedrain run shall be enclosed in a cleanout pullbox. Within the cleanout pullbox, the corrugated polyethylene underdrain pipe shall be closed with a solid plastic cap; the uphill end of all other types of underdrain pipe shall be closed with a suitable plug. Unless otherwise shown in the contract documents, the underdrain pipe shall be placed with the perforations down. In the event that the semi-circular option of the Steel Pipe underdrain is utilized, the pipe shall be placed such that the flat surface is on the top.
A.Perforated Corrugated Polyethylene Underdrain Tubing and Perforated Polyvinyl Chloride (PVC) Underdrain Pipe. When edgedrains are daylighted through the side slope, they shall be protected from sunlight by either:
1.Shield. The run of underdrain pipe shall be shielded with a minimum 3 ft. long section of corrugated steel or aluminum pipe at the outlet. The metal pipe for shielding the underdrain shall be of such internal diameter to easily slip over the underdrain. For 4 in. and 6 in. diameter underdrains, the metal pipe shielding the underdrain shall overlap the underdrain by 6 in. For underdrains from 8 in. through 12 in. in diameter, the metal shielding pipe shall overlap the underdrain by 12 in. In no case shall the outlet end of the underdrain be exposed or extend beyond the end of the metal pipe shielding it. To prevent intrusion of the filter material into the joint between the metal and underdrains, a reducer fitting shall be placed over the joint, roofing felt shall be wrapped around the joint, or another method shall be approved by the Engineer.
2.Connector Pipe. The run of underdrain pipe shall be connected to a smooth interior outlet pipe via a pipe adaptor. The pipe adaptor shall be a manufactured product specifically to allow the connection of the underdrain pipe to the smooth interior outlet pipe. The smooth interior outlet pipe shall be SDR 35 and a minimum of 3 ft. long. Perforated corrugated polyethylene underdrain tubing and perforated PVC underdrain pipe will melt and burn when exposed to flame. Flame damage or damage by deterioration, crushing or stretching will be cause for rejection.
B.Corrugated Aluminum Pipe. Do not place grout in contact with aluminum pipe, such as at drainage inlet structures, including connections, fixtures, etc., unless the aluminum has been thoroughly coated with Zinc Chromate Primer, §708-04 Zinc Chromate Primer or an equivalent alternative as approved by the Materials Bureau.
C.Optional Underdrain Pipe. Do not intermix types of underdrain in the same run of pipe.
605-3.02 Underdrain Filter. After the pipe installation has been inspected and approved, Underdrain
Filter shall be loosely placed around and over the pipe to such a depth that, after compaction, Underdrain Filter shall extend to a level 6 in. above the underdrain pipe or to the next course, whichever is less. Subsequent lifts of Underdrain Filter shall be no more than 6 in. thick prior to compaction and shall be compacted by two passes of a vibrating pad or drum type compactor. The remainder of the installation shall be in accordance with Standard Sheet 605-02 Edgedrain and Lateral Outlet Details or as indicated in the contract documents. If the excavation for the underdrain extends outside the payment lines, it shall be backfilled with Underdrain Filter material installed at the Contractor's expense.
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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 600 STANDARD SPECIFICATIONS (USC) January 1, 2026 VOLUME 3 Any contaminated underdrain filter material shall be replaced by the Contractor at no additional cost to the State. For corrugated polyethylene underdrain tubing, the filter material shall be placed around and over the tubing to such a depth that, after compaction, the underdrain filter material shall extend to a level 12 in. above the underdrain tubing or to the next course, whichever is less. After placement, the surface of the filter material shall be compacted by three passes of a vibrating pad or drum type compactor. The remainder of the backfill shall be placed in maximum 2 ft. loose lift thicknesses and compacted by three passes of a vibrating pad or drum type compactor after the placement of each lift. In the event that a pipe is not included in this installation, the filter shall be placed in horizontal layers not exceeding 6 in. in thickness prior to compacting. Each lift shall be compacted by two passes of a vibrating pad or drum type compactor. No compaction control tests will be required.
A.Underdrain Filter at Structures. Underdrain filter at structures denotes the installation of Underdrain Filter, Type I placed behind bridge abutments, walls, and other major structures requiring positive drainage to relieve large lateral pressures resulting from a saturated backfill. Underdrain Filter, Type I material shall be placed adjacent to structures in accordance with the contract documents. The lift thickness for the loose Type I material shall not exceed 6 in. and shall precede the placement of each lift of the adjacent backfill material. A physical barrier may be used to facilitate placement of the Underdrain Filter and adjacent backfill. This barrier shall not be left in place and shall be removed prior to compaction of the material. Each lift of filter material and backfill material located within a minimum distance of the footing heel projection plus 3 ft. shall be compacted simultaneously. Compactive effort for this material shall be provided by two passes of a vibratory or drum type compactor. Placement and compaction operations shall be conducted in a manner so as to ensure that the top surface of each lift of Type I filter material shall not be contaminated by the adjacent backfill materials. No compaction control tests will be required for the Type I filter material.
605-3.03 Cleanout Pullbox. Install cleanout pullboxes in accordance with Standard Sheet 605-02
Edgedrain and Lateral Outlet Details and the construction details of §670-3.08 Pullboxes. Pullboxes shall be rectangular precast concrete units shown on Standard Sheet 680-02 Standard Precast Rectangular Pullboxes, Frames, and Covers.
605-3.04 Drainage Outlet Marker. Install drainage outlet markers in accordance with Standard Sheet
605-02 Edgedrain and Lateral Outlet Details. Drainage markers shall be blue in color, fabricated as
shown on the Standard Sheets for Section 646 Delineators, Reference Markers, and Snowplowing Markers, and meet the standard, single delineator dimensions.
605-4 Method of Measurement
605-4.01 Underdrain Pipe. Underdrain pipe will be measured in feet, measured to the nearest whole
foot, installed in accordance with the contract documents.
605-4.02 Underdrain Filter. Underdrain filter material will be measured in cubic yards, measured to the
nearest whole cubic yard, installed between the payment lines shown in the contract documents. A deduction to the cross-sectional area of the underdrain trench will be made for the pipes (based on nominal diameters) when the combined cross-sectional area exceeds 1.0 sq. ft. No deduction will be made for the cross-sectional area of an existing facility.
A.Underdrain Filter at Structures. Underdrain filter, Type I material at structures will be measured in cubic yards, measured to the nearest whole cubic yard, installed between the payment lines shown
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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 600 STANDARD SPECIFICATIONS (USC) January 1, 2026 VOLUME 3 in the contract documents. No deduction will be made for the volume occupied by the underdrain pipe.
605-5 Basis of Payment
605-5.01 Underdrain Pipe. The unit price bid per foot shall include the cost of all labor, materials, and
equipment necessary to satisfactorily complete the work. The unit price bid per foot for perforated corrugated polyethylene underdrain tubing and perforated PVC underdrain pipe installations that are daylighted through the side slope shall include the shield pipe or smooth interior outlet pipe (whichever option is chosen) and necessary appurtenances including end caps and rodent screens. Cleanout pullboxes and drainage outlet markers will be paid for separately.
605-5.02 Underdrain Filter. The unit price bid per cubic yard shall include the cost of all labor,
materials, and equipment necessary to satisfactorily complete the work. Payment will be made under: Item No. Item Pay Unit 605.04xx Porous Concrete Pipe Underdrain Foot 605.05xx Extra Strength Porous Concrete Pipe Underdrain Foot 605.07xx Corrugated Steel Pipe - Type III Foot 605.08xx Corrugated Aluminum Pipe - Type III Foot 605.0901 Underdrain Filter, Type I Cubic Yard 605.1001 Underdrain Filter, Type II Cubic Yard 605.1101 Underdrain Filter, Type III Cubic Yard 605.15xx Perforated Corrugated Polyethylene Underdrain Tubing Foot 605.16xx Perforated Polyvinyl Chloride Underdrain Pipe Foot 605.17xx Optional Underdrain Pipe Foot Refer to the Standard Contract Pay Item Catalog for full Item Number and full Description.
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Source: Standard Specifications (US Customary Units), 2026 (Jan) Edition. Pages 688–691 of 1,489. View official source ↗