Summary And Conclusions

A model to predict the settling and flocculation of sediment from a stormwater detention pond was proposed. The model was applied to the rotating flume experiments in which the deposition characteristics of the pond sediment were measured. The deposition experiments carried out in the rotating flume showed that the pond sediment underwent flocculation when subjected to the flow field in the flume. The shear stress producing flocculation has to exceed certain critical level. The experiments also demonstrated the growth-limiting character of turbulence at high bed shear stresses. The formulated model was calibrated and tested using the data from the rotating flume experiments. The model predictions of concentration and size distribution as a function of time, agreed reasonably well with the measured data. The model has the potential to be used as a management and research tool for assessing the flocculation and transport of fine sediments in freshwater systems.

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