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Home / DOT Specifications / Delaware / Standard Specifications for Road & Bridge Construction / 709
MISCELLANEOUS CONSTRUCTION

709UNDERDRAINS

DE · 2026 Standard Specifications✓ Full text on BuildSpecBook pages 376–0 Save this section

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709.1Description.

This work consists of furnishing and constructing underdrains.

709.2Materials.

A.Borrow, Type C Section 1001
B.Stone, Delaware No. 57 Section 1004
C.Polyethylene Pipe Section 1031
1.AASHTO Class 2 Perforation Pattern
D.Geotextile Section 1060
E.Delineator OM-2-2V Blue Reflector
F.PCC Section 1022
G.Sign Post Section 1072
H.Rodent screen Galvanized steel screen - 1/2-inch by 1/2-inch mesh and

0.063-inch diameter galvanized steel wires.

709.3Construction.

A.Place the pipe in accordance with the contract and the Standard Construction Details. Make

lateral connections to the pipe with connectors recommended by the manufacturer.

B.Backfill perforated pipe underdrain trench with stone backfill in 6-inch lifts and consolidate to the

satisfaction of the engineer.

C.Backfill underdrain outlet pipe trenches and outlet structures in accordance with Section 207.3.D.

Use Borrow, Type C material at least 1-foot over the underdrain outlet pipe. The contractor may use excavated material for backfill above any of the Borrow, Type C in areas outside of the roadway and shoulders, provided that the excavated material meets Borrow, Type F.

D.Video the entire underdrain system before placement of the final layer of roadway pavement

material. If placing guardrail within 3-feet of the underdrain, video that section of the underdrain after guardrail installation.

E.Install the outfall delineator in accordance with contract documents.

709.4Method of Measurement.

709.4.1 Perforated Pipe. The Department will measure the quantity of perforated pipe underdrains from end-to-end as the linear feet of pipe completed and accepted. 709.4.2 Underdrain Outlet Pipe. The Department will measure the quantity of underdrain outlet pipe from end-to-end as the linear feet of pipe completed and accepted.

709.4.3 Underdrain Outlet. The Department will measure the quantity of underdrain outlets as the number of outlets installed and accepted.

709.5Basis of Payment.

709.5.1 Perforated Pipe.

A.The Department will pay the quantity of perforated pipe underdrains at the contract unit price per

linear foot. Price and payment will constitute full compensation for:

1.Providing and placing all materials;
2.constructing perforated pipe drains;
3.excavating, backfilling, compacting; and
4.video inspection.

709.5.2 Underdrain Outlet Pipe.

A.The Department will pay the quantity of underdrain outlet pipe at the contract unit price per

linear foot. Price and payment will constitute full compensation for:

1.Providing and placing all materials;
2.constructing underdrain outlet pipe;
3.excavating, backfilling, compacting; and
4.video inspection.

709.5.3 Underdrain Outlet.

A.The Department will pay the quantity of underdrain outlets at the contract unit price of each.

Price and payment will constitute full compensation for:

1.Providing and placing all materials;
2.delineator, including sign post, reflector, and hardware; and
2.excavating, backfilling and compacting.

709.5.4 Rock Excavation. If rock is encountered during excavation for perforated pipe underdrain, outlet pipe, or outlet, the Department will pay for rock excavation in accordance with Section 202. ITEM DESCRIPTION UNIT 709000 PERFORATED PIPE UNDERDRAINS, 4” LF 709001 PERFORATED PIPE UNDERDRAINS, 6” LF 709002 PERFORATED PIPE UNDERDRAINS, 8” LF 709004 PERFORATED PIPE UNDERDRAINS, 12” LF 709005 PERFORATED PIPE UNDERDRAINS, 15” LF 709006 PERFORATED PIPE UNDERDRAINS, 24” LF

ITEM DESCRIPTION UNIT 709011 UNDERDRAIN OUTLET PIPE, 6” LF 709012 UNDERDRAIN OUTLET PIPE, 8” LF 709014 UNDERDRAIN OUTLET PIPE, 12” LF 709015 UNDERDRAIN OUTLET PIPE, 15” LF 709016 UNDERDRAIN OUTLET PIPE, 24” LF 709017 UNDERDRAIN OUTLET EA

Referenced in this section

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Source: Delaware Standard Specifications for Road and Bridge Construction, 2026 Edition. Pages 376–0 of 786. View official source ↗
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