Suspended particle characteristics in storm runoff from urban impervious surfaces in Toowoomba, Australia

ISSN： 1573-062X

Source： Urban Water Journal, Vol.6, Iss.2, 2009-04, pp. : 137-146

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Abstract

Total suspended solids as a measure of suspended particles in urban stormwater has limitations and the alternative suspended sediment concentration method was adapted to determine non-coarse particle (NCP) concentration, defined as particles smaller than 500 m. NCP was partitioned into the following classes: very fine particles (<8 m, vfp),="" fine="" particles="" (8-63 m,="" fp)="" and="" medium="" particles="" (63-500 m,="" mp).="" a="" site="" mean="" concentration="" approach="" was="" adopted="" to="" differentiate="" the="" suspended="" particle="" characteristics="" between="" three="" impervious="" surfaces="" (roof,="" road="" and="" car="" park)="" using="" runoff="" data="" collected="" for="" 35="" storms.="" runoff="" particle="" size="" distribution="" (psd)="" of="" all="" surfaces="" was="" dominated="" by="" particles="" less="" than="" 63 m.="" a="" weak="" trend="" of="" relatively="" constant="" vfp="" concentration="" was="" present="" in="" the="" road="" runoff="" data.="" roof="" runoff="" psd="" became="" finer="" as="" ncp="" concentration="" increased="" and,="" overall,="" the="" psd="" of="" car="" park="" runoff="" was="" coarser="" compared="" to="" road="" and="" roof="" runoff.="" these="" findings="" have="" runoff="" treatment="" implications="" as="" settling="" processes="" are="" influenced="" by="" particle="" size.="">