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MODEL SPECIFICATION
GEOCOMPOSITE DRAIN SYSTEM FOR PAVED SURFACES
1.1 |
This work shall consist of providing and placing a geocomposite
prefabricated drain system as described in the plans. The drainage
system shall be installed in accordance with these specifications
and in close conformity with the locations and dimensions as shown
on the plans or specified by the engineer. The quantities of drain
as shown on the plans may be increased or decreased at the direction
of the engineer based on actual site conditions that occur during
construction of the project. Such variations in quantity will not
be considered as alterations in the details of construction or a
change in the character of the work. |
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2.1 |
The drain conduit shall be of flexible, prefabricated, rounded rectangular
shaped, composite product. |
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2.1.1 |
The drain conduit shall be wrapped with a non-woven geotextile.
This non-woven wrap shall be of a needle-punched construction consisting
of long-chain polymeric fibers composed of polypropylene, polyethylene
or polyamide. The fibers shall be oriented into a multi-directional
stable network whereby they retain their positions relative with
each other and allow the passage of water as specified. The fabric
shall be free of any chemical treatment or coating, which reduces
permeability and shall be inert to chemicals commonly found in soil.
The geotextile shall conform to the following minimum average roll
values. |
|
| Weight |
ASTM
D-3776 |
4.0 |
| Tensile
Strength |
ASTM
D-4632 |
100
|
| Elongation
% |
ASTM
D-4632 |
50
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| Puncture,
lb |
ASTM
D-751 |
50 |
| Mullen
Burst, psi |
ASTM
D-3786 |
200 |
| Trapezoidal
Tear, lb |
ASTM D-4533 |
42 |
| Coefficient
of Permeability |
ASTM
D-4491 |
.1
cm/sec |
| Flow
Rate, gpm/ft2 |
ASTM
D-4491 |
100
|
| Permittivity,
1/sec |
ASTM
D-4491 |
1.8 |
| Apparent
Opening Size |
ASTM
D-4751 |
70
Max. US Std Sieve Opening |
| Seam
Strength, lb/ft |
ASTM
D-4595 |
100 |
| Fungus
|
ASTM
G-21 |
No growth |
2.1.2 |
The drainage core shall be made of a high-density polyethylene.
The core shall be constructed using interconnected corrugated pipes
that define and provide the flow channels and structural integrity
of the drain. The geotextile shall function only as a filter. The
core of the edge drain shall conform to the following physical property
requirements. |
|
| Thickness,
inches |
ASTM
D-1777 |
1.0 |
Flow Rate, gpm/ft* |
ASTM
D-4716 |
29 |
Compressive Strength, psf
|
ASTM
D-1621
(modified sand method) |
6000 |
* At gradient = 0.1, pressure = 10 psi for 100 hours.
2.1.3 |
Multi-Flow
meets or exceeds these specifications.
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2.2
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The
fittings used with the edge drain shall be of a snap together design.
In no case shall any drainage product be joined without the use
of the manufacturers connector designed specifically for the purpose. |
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2.3 |
Pipe
for edge drain outlet laterals shall be either PVC pipe meeting
the requirements of ASTM D-2729 or ASTM F-949, or high-density polyethylene
pipe meeting the requirements of AASHTO M252. |
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2.4
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A
rodent screen made of 0.3 inch by 0.3 inch square opening size,
0.063 inch gauge, stainless steel or galvanized, welded wire mesh
shall be installed in each outlet lateral line. When using galvanized
welded wire mesh, the rodent screen shall be galvanized after it
has been formed to the shape and dimensions shown on the plans or
specified by the engineer. |
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3.0
CONSTRUCTION REQUIREMENTS |
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3.1 |
The
amount of trench excavated at any time shall not exceed the amount
of drain that can be set and backfilled completely in one working
day. The trench shall be 4 inches wide and at the depth specified
in the plans. The drain product shall be centered in the trench,
and backfilled with clean sand whose particle size is defined as
less than 5% retained on a #10 screen, and less than 5% passing
through a # 30 screen. No more than 1% shall pass a #50 screen.
(all US Standard Sieve sizes) |
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3.2 |
The
trench excavations for the drain and outlet laterals shall be to
the lines and grades shown on the Plans. Over excavation in the
bottom of the excavation shall be backfilled to the proper grade
with excavated material or sand prior to the placement of the drain. |
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3.3 |
Fittings
for the drain shall be installed in accordance with the manufacturer's
recommendations. |
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3.4 |
Backfill
shall be placed in maximum of 18-inch loose lifts. Compaction of
the backfill shall be done in accordance with the plans or as directed
by the engineer. |
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3.5 |
Any
damaged edge drain or outlet lateral shall be replaced or repaired
by splicing in an undamaged section of drain. |
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Paved
Surfaces Model Specs in PDF Format
service@varicore.com Copyright 2001; Varicore Technologies, Inc.
800-978-8007
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