The effect of permeable pavement on water quality and quantity

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ABSTRACT

Three studies have been conducted by NC State University faculty since 1999 regarding permeable pavement. A test of long term hydrologic conductivity was conducted on three lots in Eastern NC. The initial hydrologic infiltration rate study showed a significant reduction in surface runoff. The Curve Numbers at the Kinston, Wilmington, and Swansboro sites were 79, 89, and 45 respectively for storms exceeding 50 mm. A study of surface infiltration rates at 48 permeable pavement sites showed that locating permeable pavement in stable watersheds and regular maintenance significantly increased surface infiltration rates. This research prompted the state of North Carolina to reconsider their stormwater credit for permeable pavement allowing it to be considered 60% grassed and 40% impervious. A water quantity and quality study of 4 permeable pavement types in Kinston, NC was performed in a parking lot consisting of four different types of permeable pavements and standard asphalt in Kinston, NC. The permeable pavement sections consist of permeable interlocking concrete pavers (PICP1) with 8.5 % void space, PICP with 12.9 % void space (PICP2), concrete grid pavers (CGP), and porous concrete (PC) located directly adjacent to each other. There was a significant reduction in runoff by all types of permeable pavement with little difference among them. There was no significant improvement in water quality observed during the study. There is no differentiation between the permeable pavement types for stormwater purposes by the state of North Carolina.

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