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Line 139: ==Construction Considerations==Construction of permeable pavement is a specialized project and should involve experienced contractors. The following general recommendations apply: *'''Sediment Control''': The treatment area should be fully protected during construction so that no sediment reaches the permeable pavement system and proper erosion and sediment controls must be maintained on site. *'''Weather''': Porous asphalt and pervious concrete will not properly pour and set in extremely high or low temperatures <ref>City of Portland. 2004. Portland Stormwater Management Manual. Prepared by the Bureau of Environmental Services (BES). Portland, OR.</ref>. One benefit to using permeable pavers is that their installation is not weather dependent. *'''Pavement placement''': Properly installed permeable pavement requires trained and experienced producers and construction contractors.
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===Modeling permeable paving in the Treatment Train Tool===
===Modeling permeable paving in the Treatment Train Tool===
'''[[Permeable paving: TTT]]'''
'''[[Permeable paving: TTT]]'''
==Construction Considerations==
Properly installed permeable pavement requires trained and experienced construction contractors. The following general recommendations apply:
*'''Sediment Control''': The treatment area should be fully protected during construction so that no sediment reaches the permeable pavement system. Construction vehicle traffic should not be permitted on the permeable pavement and its drainage areas once the pavement has been installed.
*'''Base Construction''': Aggregate should be placed in 100 mm to 150 mm lifts and compacted with a minimum 9 ton steel drum vibratory roller. A light weight deflectometer may be used to test compaction level of open graded stone and compare to specifications.
*'''Weather''': Porous asphalt and pervious concrete require a specific temperature range to set properly and the setting time can be several days. <ref>City of Portland. 2004. Portland Stormwater Management Manual. Prepared by the Bureau of Environmental Services (BES). Portland, OR.</ref>.
==Landscaping and grading==
==Landscaping and grading==
Partial infiltration designs with underdrains generate more runoff, and as a result, are often used in studies investigating the water quality impact of permeable pavements on surface waters. These studies show load reductions above 50% for total suspended solids, most metals and hydrocarbons <ref>Legret, M and V. Colandani. 1999. Effects of a porous pavement structure with a reservoir structure on runoff water: water quality and fate of metals. Water Science and Technology. 39(2): 111-117</ref> <ref>Pratt, C.J., Mantle, J.D.G., Schofield, P.A. 1995. UK research into the performance of permeable pavement reservoir structures in controlling stormwater discharge quantity and quality. Water Science Technology. Vol. 32. No. 1. pp. 63-69.</ref> <br>
Partial infiltration designs with underdrains generate more runoff, and as a result, are often used in studies investigating the water quality impact of permeable pavements on surface waters. These studies show load reductions above 50% for total suspended solids, most metals and hydrocarbons <ref>Legret, M and V. Colandani. 1999. Effects of a porous pavement structure with a reservoir structure on runoff water: water quality and fate of metals. Water Science and Technology. 39(2): 111-117</ref> <ref>Pratt, C.J., Mantle, J.D.G., Schofield, P.A. 1995. UK research into the performance of permeable pavement reservoir structures in controlling stormwater discharge quantity and quality. Water Science Technology. Vol. 32. No. 1. pp. 63-69.</ref> <br>
As with all stormwater infiltration practices, risk of groundwater contamination from infiltration of runoff laden with road de-icing [[salt]] constituents (typically sodium and chloride) is a significant concern. Chloride ions are extremely mobile in the soil and are readily transported by percolating water to aquifers.
As with all stormwater infiltration practices, risk of groundwater contamination from infiltration of runoff laden with road de-icing [[salt]] constituents (typically sodium and chloride) is a significant concern. Chloride ions are extremely mobile in the soil and are readily transported by percolating water to aquifers.
==Inspection and Maintenance==
==Inspection and Maintenance==
*[https://www.hahnplastics.com/ca/products/ground-reinforcement-and-surfaces/hanpave/ Hanpave]
*[https://www.hahnplastics.com/ca/products/ground-reinforcement-and-surfaces/hanpave/ Hanpave]
*[https://www.hahnplastics.com/ca/products/ground-reinforcement-and-surfaces/heavy-duty-ground-grid/ HAHN heavy duty ground grid]
*[https://www.hahnplastics.com/ca/products/ground-reinforcement-and-surfaces/heavy-duty-ground-grid/ HAHN heavy duty ground grid]
==Gallery==
==Gallery==
{{:Permeable paving: Gallery}}
{{:Permeable paving: Gallery}}
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