Permeable pavements are one proven solution for improving stormwater runoff quantity and quality. They are load bearing and can be designed for local roads as a substitute for impervious bitumen road surfaces. Permeable pavements allow water to infiltrate through large gaps in the pavers into a series of filter media before being either released into the ground water or harvested in tanks under the pavement for later reuse. One of the perceived drawbacks of permeable pavements is that they have a high tendency to clog, especially if not properly installed and maintained. The clogging process involves sediment particles becoming trapped within the voids of the pavement substructure aggregates, which over time can reduce the infiltration capacity of the pavement. The processes that occur during the clogging process of permeable pavements are still not fully understood and there has been little research into these processes to date. The objective of this report was to explore the processes of sediment clogging within permeable pavement substructures by modelling stormwater runoff on permeable pavement substructures with various types of sediment. Sediment samples were collected from stormwater pits in five inland, urban and coastal locations on the Sunshine Coast. The samples obtained were analysed in the laboratory and results indicated that sediments found within the Sunshine Coast could be suitably represented through two different sediment profiles. Sediment Profile 1 was collected from the Happy Valley car park in Caloundra, this sample has a considerably different sediment size distribution compared to the other four sites, as determined by the analysis undertaken. Profile 2 was a mixture of samples from the other four further inland locations.
Submitted in the fulfilment of the requirements of the degree of Bachelor of Engineering (Civil Engineering), University of the Sunshine Coast, 2011.