Changes

In permeable pavement systems, the sub-base is the layer of granular material that is laid on the sub-grade. The granular sub-base should be clear, crushed 50 mm stone. See the Permeable pavements: Specifications page for detailed sub-base material specifications. The construction steps, key inspection points, and mistakes to avoid for sub-base reservoir are the same as / similar to the guidance given in the storage reservoir section.  

In permeable pavement systems, the sub-base is the layer of granular material that is laid on the sub-grade. The granular sub-base should be clear, crushed 50 mm stone. See the Permeable pavements: Specifications page for detailed sub-base material specifications. The construction steps, key inspection points, and mistakes to avoid for sub-base reservoir are the same as / similar to the guidance given in the storage reservoir section.  

However, depending on the municipality and the design, compaction of the sub-base reservoir may be required. For example, the City of Toronto’s Construction Specification for Permeable Interlocking Concrete Pavers (TS 861) details the following steps for sub-base installation:

However, depending on the municipality and the design, compaction of the sub-base reservoir may be required. For example, the [[City of Toronto’s Construction Specification for Permeable Interlocking Concrete Pavers https://www.toronto.ca/wp-content/uploads/2021/08/952c-ecs-specs-gi-specs-TS861Sep2021.pdf]]<ref>City of Toronto. 2021. TS 861 Construction Specifications for Permeable Interlocking Concrete Pavers. https://www.toronto.ca/wp-content/uploads/2021/08/952c-ecs-specs-gi-specs-TS861Sep2021.pdf</ref> details the following steps for sub-base installation:

#Place sub-base aggregate in 200 mm lifts (maximum)

#Place sub-base aggregate in 200 mm lifts (maximum)