Abstract
The effect of varying runoff on a clogged permeable surface was analysed using a specifically designed laboratory rig consisting of a variable gradient testing frame, a rain simulator and water collecting chambers. The results indicate that the apparatus can be used successfully to test the runoff resistance of concrete blocks in permeable surfaces. The results indicate that a surface at 2% gradient that is clogged with crushed construction debris still permits significant levels of infiltration.
Highlights
Pervious pavements are an important subset of SUDS (Sustainable Urban Drainage Systems) and BMPs (Best Management Practices) (Pratt et al, 2002)
The runoff resistance performance of the tested permeable surface is given by the percentage water infiltration within the pavement length
The results indicate that a surface of permeable blocks at 2% gradient that is clogged with crushed construction debris still permits significant levels of infiltration
Summary
Pervious pavements are an important subset of SUDS (Sustainable Urban Drainage Systems) and BMPs (Best Management Practices) (Pratt et al, 2002). Pervious surfaces can be divided in porous and permeable pavements. Permeable pavements are surfaced with non-porous materials that filter through inlets or slots in the surface (Pratt, 1997). This is the case in permeable concrete block paving. Some advantages of pervious surfaces in general are their high removal capacity of soluble and fine particulate pollutants in urban runoff, as well as the possibility of allowing groundwater recharge and controlling stream bank erosion (Novotny et al, 1994). The use of pervious surfaces reduces land consumption, preserves the natural water balance at the site and improves the skid resistance of the surface, reducing hydroplaning (Schueler, 1987)
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