Viridian III Technical Specification OPW1 [As Published] · 142008.256

                                                                       VIRIDIAN III - Landscape Works
Drainage pipes and associated fittings and jointing procedures shall comply with the
requirements specified in the following reference:

Plastic pipes (Perforated): AS 2439-Part 1 "Perforated Drainage Pipe and Associated
Fittings"

Perforations shall not exceed 0.7 mm diameter or width.



4.1.3   SUBSOIL DRAINAGE GEOFABRIC MATERIAL

Geotextile material used in subsoil drains shall be a non-woven type and shall have the
following properties prior to exposure to sunlight at the site.

Geotextile strength rating (G) of greater than 900

Flow rate under 100 mm constant head as determined using the Permittivity Test procedures
stated in AS 3706.9 of greater than 501/m2/s.

Equivalent opening size (EOS) of the geotextile as determined using the procedures stated
in AS 3706.7 of less than 200 micro metres for granular soils (i.e., D50s greater than 75 micro
metres) and the EOS of less than 85 micro metres for cohesive soils (i.e., D50s less than
75 micro metres).


4.2     SURFACE DRAINAGE

4.2.1   GENERAL

Field Inlets

Surface drainage pits shall be installed to locations and levels as indicated on the landscape
drawings and confirmed by the site engineer. Finish surface pit level flush with surrounding
surface finish levels. Ensure positive overland drainage flow to all pits and that no ponding
occurs around the pit. Align all pits square to paths, pavement patterns, kerbs, walls and the
like.

Install pit to manufacturer’s recommendations

Product: Aco 450X450 Commercial Drain Sump with Standard HDG (Medium Duty) bolt
down Mesh Grate or approved equal.




                                     END OF SECTION




EDAW Aust                             Page 14                       February 2008