Part 1 — General
1.1 Section Includes
A.Pipe underdrains .
1.2 Related Sections
A.Section 02056: Embankment, Borrow, and Backfill
B.Section 02075: Geotextile s
C.Section 02317 : Structural Excavation
D.Section 02633: Concrete Drainage Structures
1.3 References
A.AASHTO M 252: Corrugated Polyethylene Drainage Pipe
B.AASHTO M 278: Class PS46 Poly (Vinyl Chloride) (PVC) Pipe
C.AASHTO M 294: Corrugated Polyethylene Pipe, 300- to 1500- mm (12 - to 60-in.) Diameter
D.AASHTO M 304: Poly (Vinyl Chloride) (PVC) Profile Wall Drain Pipe and Fittings Based on Controlled Inside Diameter
E.AASHTO M 330: Polypropylene Pipe, 300- to 1500- mm (12 - to 60 -in.) Diameter
F.AASHTO PP 63 : Pipe Joint Selection for Highway Culvert and Storm Drains
G.AASHTO National Transportation Product Evaluation Program (NTPEP)
1.4 Definitions
A.Profile Wall Pipe – A pipe that has a smooth interior wall with an exterior that is either is ribbed, corrugated, or smooth. The wall may contain hollow cores.
1.5 Submittals
A.Manufacturer’s product data sheet s and installation instructions for information.
B.Documentation from AASHTO NTPEP showing complian ce with Table 1 for the pipe material and diameter supplied for information .
Part 2 — Products
2.1 Pipe
A.Thermoplastic p rofile wall pipe having perforations around the entire circumference meeting the material requirements shown in Table 1. Table 1 Perforated Pipe Material Specifications Material Type AASHTO Specification High Density Polyethylene (HDPE) M 252, M 294 Polyvinyl Chloride (PVC) M 278, M 304 Polypropylene M 330
B.Soil tight pipe joint s according to AASHTO PP 63.
C.Pipe fittings match ing the pipe material type.
2.2 Drainage Geotextile
A.Refer to Section 02075.
2.3 Free Draining Granular Backfill
A.Refer to Section 020 56.
Part 3 — Execution
3.1 Installation
A.Excavate a trench to a width of the outside pipe diameter plus 2 ft and to a depth of 3 inch below the bottom of the pipe .
1.Refer to Section 02317.
2.Keep trenches free of water.
B.Grade and prepare the bottom of the trench to provide a firm and uniform bearing surface.
C.Place drainage geotextile within the trench as shown.
D.Place and compact the bottom 3 inch of the trench with free draining granular backfill.
E.Connect pipes to concrete drainage structures according to Section 02633.
1.Place an end c ap at the upstream end of the pipe when not connected to a structure.
F.Place and compact the remainder of the free draining granular backfill to depth shown.
Source: Utah Standard Specifications for Road and Bridge Construction, 2026 Edition. Pages 388–390 of 1,331.