Changes

Permeable pavers are ideal for sites with limited space and projects such as low traffic roads, parking lots, driveways and walkways. Components include: interlocking pavers, precast pervious slabs, cast in place surface, bedding course, and underground storage layer. Additional components include an underdrain to remove excess water and soil additives to enhance pollutant removal.

Permeable pavers are ideal for sites with limited space and projects such as low traffic roads, parking lots, driveways and walkways. Components include: interlocking pavers, precast pervious slabs, cast in place surface, bedding course, and underground storage layer. Additional components include an underdrain to remove excess water and soil additives to enhance pollutant removal.

STEP recommendations:

====STEP recommendations:====

*[[Bedding layer]] and [[Permeable pavements: Specifications|joint filler]] should consist of [[clear stone]] and [[gravel]] rather than [[sand]] to prevent [[clogging]].

*[[Bedding layer]] and [[Permeable pavements: Specifications|joint filler]] should consist of [[clear stone]] and [[gravel]] rather than [[sand]] to prevent [[clogging]].

*Granular materials should not be applied as anti-skid agents during winter because they can quickly clog the system.

*Granular materials should not be applied as anti-skid agents during [[winter]] because they can quickly clog the system.

*Winter maintenance practices should be limited to plowing, with de-icing salts applied sparingly.

*[[Winter Management|Winter maintenance]] practices should be limited to plowing, with [[Salt|de-icing salts]] applied sparingly.

*The slope of the permeable pavement surface should be at least 1% and no greater than 5%.

*The [[Permeable pavements: Specifications|slope]] of the permeable pavement surface should be at least 1% and no greater than 5%.

*The impervious land surround and draining onto the pavement should not exceed the area of the permeable pavement.

*The impervious land surrounding and draining onto the pavement should not exceed the area of the permeable pavement (1:1 / I:P ratio).

*Pervious surfaces should not drain onto the pavement.

*Pervious surfaces should not drain onto the pavement.

*The storage layer must be sized to accommodate runoff from the pavement and any impermeable areas draining to it.<br>

*The [[Permeable pavements: Specifications|storage layer]] must be [[Permeable pavements: Sizing|sized to accommodate runoff]] from the pavement and any impermeable areas draining to it.<br>

Tool defaults based on STEP recommendations:

====Tool defaults based on STEP recommendations:====

* Maximum drainage area to surface area ratio of 1:1 (or 4:1 for roofs that contribute clean runoff to the practice)

* Maximum drainage area to surface area ratio of 1:1 (or 4:1 for roofs that contribute clean runoff to the practice)

* Default Bedding depth of 50 millimeters.

* Default Bedding depth of 50 millimeters.