Abstract
The progressive changes were examined of size and surface texture of suspended sediment transported along a drain in storm discharge. The catchment, in North West London, covered 420 ha, was of mixed urban land use and served by a separate sewer system. Sediment was examined using an electronic particle counter and scanning electron microscopy. A Fuzzy Classification technique was used to analyse the micrographs. Particle size distributions were predominantly bimodal and explained by cementation by silica of individual particles into aggregates. The degree of particle abrasion and of cementation increased with the distance travelled downstream. This relationship is interrupted by the settling pond in the storm drain which is shown to play a significant role in allowing larger, individual particles and aggregates to settle out.
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