Abstract
Principal spillway filter envelopes of expanded polystyrene chips (EPS) and 2-B gravel were compared to a no-filter control to assess their effectiveness in capturing sediment from a laboratory scale sedimentation basin. Each filter was evaluated with two perforated risers, one designed to dewater the basin in 1.5 h and the other in 3.0 h. The average sediment retention efficiencies for the no-filter treatments were 59.8 and 71.0% for the 1.5- and 3.0-h outlet configurations, respectively. Perforated risers encased in 508-mm-diameter envelopes of EPS chips and gravel had sediment retention efficiencies, averaged over dewatering time, of 84 and 82%, respectively. The 1.5- and 3.0-h dewatering times had sediment retention efficiencies, averaged over the EPS- and gravel-filter treatments, of 78.3 and 87.5%, respectively. Both EPS and gravel envelopes show promise in enhancing the sediment captured from sedimentation basins.
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