Abstract
The degree of uniform sediment concentration and particle size distribution at 13 spatially distributedsampling points in a 155-m3 sedimentation basin during the inflow period of six identical 100-m3 inflow hydrographscontaining 454 kg of sediment was evaluated. The six events represented the sediment concentration and particle sizedistributions in three replications each of an unlined and a lined (no re-suspension) basin. Sediment concentrationsobserved at all sampling locations and up to 12 sampling times showed no significant difference during either the lined orunlined treatments. These results strongly confirm that sediment concentrations were consistent with those expected in asingle, completely mixed reactor. The unlined treatment, however, yielded sediment concentrations 36% higher and thesuspended particle sizes averaged 3.7 m smaller than during the lined treatment. The increased mass of smallerparticles suspended during the unlined treatment was attributed to an increased amount of re-suspended sediment.
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