title: Understanding the physical processes of pollutant build-up and wash-off on roof surfaces.
abstract: Pollutants originating with roof runoff can have a significant impact on urban stormwater quality. This signifies the importance of understanding pollutant processes on roof surfaces. Additionally, knowledge of pollutant processes on roof surfaces is important as roofs are used as the primary catchment surface for domestic rainwater harvesting. In recent years, rainwater harvesting has become one of the primary sustainable water management techniques to counteract the growing demand for potable water. This paper presents the outcomes of an in-depth research study into particulate matter build-up and wash-off for roof surfaces. In this research, particulate matter was considered as the indicator pollutant where the processes related to other pollutants can be predicted based on the understanding generated for particulate matter. The study outcomes confirm that the build-up process on roof surfaces is comparatively similar to road surfaces. However, particle loads collected from roofs were significantly less compared to road surfaces and much finer in texture. Wash-off from roofs also showed significant similarities to wash-off from roads. A relatively high concentration of particulate matter was noted during the initial part of storm events. Furthermore, the amount of particulate matter remaining on the roof surfaces was significantly high for less intense rain events.
authors.affiliation: School of Urban Development, Queensland University of Technology, GPO Box 2434, Brisbane QLD 4000, Australia. p.egodawatta@qut.edu.au
authors.forename: Prasanna
authors.initials: P
authors.lastname: Egodawatta
authors.forename: Evan
authors.initials: E
authors.lastname: Thomas
authors.forename: Ashantha
authors.initials: A
authors.lastname: Goonetilleke
mesh_terms: D003252:Construction Materials; D052638:Particulate Matter / Q000737:chemistry*; D011891:Rain; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D052638:Particulate Matter; D014874:Water Pollutants, Chemical