Paying Attention To The Details
Set bottom of notch in weir plate to desired storage elevation in the Base/subbase
Concrete Permeable Pavers
OUTLET CONTROL DEVICE
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
RUN-ON SEDIMENT CONTROL
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.
Geotextile
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
PICP ADJACENT TO BUILDINGS
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
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