Landscape Technical Specification - OPW14/0197

Doonella – Stage C
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).

4.1.7    SUBSURFACE DRAINAGE

Field Inlets

Surface drainage pit shall be installed to locations and levels as indicated on the landscape drawings.
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.

Continuous Surface Drain

Type: Aquadux Diamond Series Continuous Surface Drainage System

Size: 100mm Wide.

Surface drainage system shall be installed to locations and levels as indicated on the landscape drawings.
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 components square to paths, pavement
patterns, kerbs, walls and the like.

Install pit to manufacturer’s recommendations


4.1.8    COMPLETION

Cleaning

General: Clean and flush the whole installation.




AECOM                                        2