### **ITEM D-702 SLOTTED DRAINS**

DESCRIPTION

**702-1.1** This item shall consist of the construction of steel slotted
drains or cast iron slotted vane drains in accordance with these
specifications and in reasonably close conformity with the lines and
grades shown on the plans. Type detail shall be shown on the plans.

MATERIALS

**702‑2.1 GENERAL.** All slotted drains shall meet the requirements
shown on the plans and specified below. All slotted drains shall meet
specified hydraulic design requirements and shall support the loadings
specified.

**702‑2.2 PIPE.**

**a. Steel slotted Drain.** Pipe shall be metallic coated (galvanized or
aluminized steel type II) corrugated steel type I meeting the
requirements of ASTM A760. Pipe diameter and gage shall be as shown on
the plans.

The corrugated steel pipe shall have a minimum of two rerolled annular
ends.

**b. Cast Iron Slotted Vane Drain.** Polyvinyl Chloride (PVC) pipe shall
meet the requirements of ASTM D 3034. Pipe diameter shall be as shown on
the plans. The pipe shall have an open slot to accept the cast iron
slotted vane drain castings.

**702‑2.3 GRATES AND CASTINGS.**

**a.** **Steel Slotted Drain.** Grates shall be manufactured from ASTM A
36 or A 570, Grade 36 steel. Spacers and bearing bars (sides) shall be
3/16-inch (5 mm) material. The spacers shall be welded to each bearing
bar with four 1‑1/4-inch long 3/16-inch wide (32 mm long by 5 mm wide)
fillet welds on each side of the bearing bar at spacings not exceeding 6
inches (150 mm). The grates shall be 6 inches (150 mm) high or as shown
on the plans and shall have a maximum 1‑3/4‑inch (45 mm) opening in the
top.

Grates shall be galvanized in accordance with ASTM A 123 except with a
2 ounce per square foot (0.61 kg per square meter) galvanized coating.

The grates shall be fillet welded to the corrugated steel pipe with a
minimum weld 1 inch (25 mm) long on each side of the grate at every
other corrugation. Weld areas and the heat affected zones where the slot
is welded to the corrugated pipe shall be thoroughly cleaned and painted
with a zinc-rich paint in accordance with repair of damaged coatings in
ASTM A 760.

Each 20-foot (6.1 m) length of drain delivered to the job site shall be
within the following tolerances: vertical bow +/- 3/8 inch (9.5 mm),
horizontal bow +/- 5/8 inch (16 mm), twist +/- 1/2 inch (12.5 mm).

**b. Cast Iron Slotted Vane Drain.** Castings shall meet the
requirements of ASTM A 48, Class 35B gray iron. Castings shall be
furnished with no coatings.

Castings shall be designed to fit on open slots in 15-inch (380 mm) PVC
pipe. Casting sections shall not exceed three feet (915 mm) in length.
Casting sections shall have a built-in vane configuration with bar
spacings not exceeding 6 inches (150 mm). The opening at the surface
shall not exceed 3‑3/4 inches (95 mm), and the vane shall be constructed
on a radius so that the opening shall be less than 1‑1/2 inches (38 mm)
at a depth of 1-1/2 inches (38 mm) as measured vertically from the
surface. Casting sections shall integrally lock into the concrete by use
of top and bottoms flanges and shear tabs. Castings shall accept bolts
for bolting sections together and shall accept wire for fitting to pipe.

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> **The Engineer should note that certain standard details can be found
> in AASHTO AGC-ARTBA publication "A Guide to Standardized Highway
> Drainage Products". All products used shall meet the strict airport
> loading and tire pressure requirements.**

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**702‑2.3 CONCRETE.**

**a. Steel Slotted Drain.** Concrete shall have a minimum compressive
strength of 1,000 psi (6.9 Mpa) at 28‑days when tested in accordance
with ASTM C 39.

**b. Cast Iron Slotted Vane Drain.** Concrete shall have a minimum
compressive strength of 3,000 psi (20.7 Mpa) at 28‑days when tested in
accordance with ASTM C 39.

**\[702-2.3 CONCRETE. Plain or reinforced concrete used shall conform to
the requirements of Item P‑610.\]**

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> **If design requirements indicate the need for structural concrete,
> the Engineer should include Item P‑610 Structural Portland Cement
> Concrete.**

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CONSTRUCTION METHODS

**702‑3.1 EXCAVATION.** The width of the trench shall be sufficient to
permit satisfactory installation and jointing of the slotted drain and
placing of a high slump concrete backfill material under and around the
drain, but shall not be less than the external pipe diameter plus
6 inches (150 mm) on each side. The depth of the trench shall be a
minimum of 2 inches (51 mm) below the invert for steel slotted drain and
6 inches (150 mm) below the invert for cast iron slotted vane drain.

The trench may be roughly shaped to the slotted drain bed.

**702‑3.2 INSTALLATION.** Steel slotted drain shall be laid in sections
joined firmly together with coupling bands, or as shown on the plans.
Cast iron drains shall be wired to the top of the PVC pipe in the slot
cut in to receive the castings. The top of all drains shall be held
firmly in place to the proper grade, to preclude movement during the
backfilling operation.

**702‑3.3 JOINING.** Slotted steel drain joints shall be firmly joined
by modified hugger type bands, or as indicated, to secure the pipe and
prevent infiltration of the backfill. When the slotted steel drain is
banded together, the adjacent grates shall have a maximum 3 inch (76 mm)
gap. Cast iron drains castings shall be bolted together.

**702‑3.4 BACKFILLING.** Slotted drains shall be inspected before any
backfill is placed. Damaged drains shall be aligned or replaced at the
expense of the Contractor.

The slotted drain assembly shall be backfilled with concrete that will
easily flow under and around the drain and the trench wall. The opening
in the top of grates and castings shall be covered to prevent unwanted
material from entering the drain during the backfilling and subsequent
surfacing operations.

METHOD OF MEASUREMENT

**702‑4.1** The length of slotted drain shall be measured in linear feet
(meters) of slotted drain in place, completed, and approved. It shall be
measured along the centerline of the drain from end or inside face of
structure to the end or inside face of structure, whichever is
applicable. The several classes, types, and sizes shall be measured
separately. All fittings shall be included in the footage as typical
pipe sections being measured.

BASIS OF PAYMENT

**702‑5.1** Payment shall be made at the contract unit price per linear
foot (meter) for each kind of slotted drain type and size designated and
at the contract unit price per cubic yard (cubic meter) of concrete for
backfill.

These prices shall be full compensation for all materials, all
preparation, excavation and installation of these materials; and all
labor, equipment, tools, and incidentals necessary to complete the item.

Payment will be made under:

> Item 702‑5.1 \[ \] inch (mm) diameter \[ gage\] pipe per linear foot
> (meter)

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> **The Engineer shall include a pay item for each size and gage pipe
> specified for each drain type.**

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> Item 702‑5.2 Concrete for backfill‑per cubic yard (cubic meter).

TESTING REQUIREMENTS

> ASTM C 39 Compressive Strength of Cylindrical Concrete Specimens

MATERIAL REQUIREMENTS

> ASTM A 36 Structural Steel
>
> ASTM A 48 Gray Iron Castings
>
> ASTM A 123 Zinc Coating (Hot-Dip) on Iron and Steel Products
>
> ASTM A 570 Steel, Sheet and Strip, Carbon, Hot-Rolled, Structural
> Quality
>
> ASTM A 760 Corrugated Steel Pipe, Metallic-Coated for Sewers and
> Drains
>
> ASTM D 3034 Type PSM Poly (Vinyl Chloride), (PVC), Sewer Pipe and
> Fittings
>
> Information A guide to Standardized Highway Drainage Products
> disseminated under the sponsorship of the American Association of
> State Highway and Transportation Officials, Associated General
> Contractors, and the American Road and Transportation Builders
> Association

**END OF ITEM D-702**

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