Oaks Designer Resource Guide 6.0 (Canada)

Paying Attention To The Details

Set bottom of notch in weir plate to desired storage elevation in the Base/subbase

Concrete Permeable Pavers


Removable weir plate (slides into brackets mounted on opposite sides of the chamber)

Precast Concrete Curb

Bedding Layer (ASTM No. 8 Stone, or equivalent) 50mm (2”) thick Base Layer (ASTM No.57 Stone, or equivalent) Subbase Layer (ASTM No.2 Stone, or equivalent) Geotextile Separation Fabric

This device consists of a concrete or plastic vault with a weir plate through the middle. Use it with Partial-Infiltration systems to set the storage elevation of the base/sub-base (where the water does not discharge until it reaches the weir notch) or with No-Infiltration systems to regulate the outlet discharge rate (drill a flow restricting hole through the weir plate).

Solid Header Pipe to Outlet Control Structure

Perforated Collection Pipe within trench below Subbase, minimum 75mm pipe bedding (ASTM No. 57) on all side

Discharge pipe to storm sewer, or daylight to surface feature

Precast concrete or molded plastic chamber with removable lid

Downspout emergency overflow

Catch Basin with Grated Lid

Diffuser Pipe


When adding roof water and storm water from adjacent impervious surfaces, you may need a receiving structure to handle potential sediment and contaminant loads. This diagram shows a sediment control chamber. Please consult with Oaks staff for more information about available alternatives.


50mm minimum from bottom of permeable sub-base

100mm diametre minimum inlet from downspout

100mm diametre minimum outlet

Filter Unit

Cut liner so not visible and fasten to building wall


Concrete Permeable Pavers Slope to drain away from building

30 mil PVC Liner complete with 12 oz protective non- woven geotextile Optional Platon membrane (or equivalent) Expansion material

Geotextile separation fabric (as required) Subbase Layer (ASTM No.2 Stone, or equivalent) Base Layer (ASTM No.57 Stone, or equivalent) Bedding Layer (ASTM No. 8 Stone, or equivalent)

Building foundations should be protected from water infiltration by: sloping the PICP away from the building; waterproofing the building foundation; installing an impermeable liner near the foundation wall.

Existing building wall and foundation footing

Distance to suit local ground condition

Permeable native soil subgrade. DO NOT compact unless infiltration rate reduction is accounted for in the hydraulic design calculations.

Extend liner to bottom of building foundation


Made with FlippingBook - Online magazine maker