Click on “Download PDF” for the PDF version or on the title for the HTML version.

If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options.

Twelve simulated 35mm, 2yr, 24hr runoff events from a denuded 0.4ha construction site in Pennsylvania were introduced into a 51m 3 sedimentation basin. Each event consisted of a 100m 3 inflow hydrograph that contained a sedigraph with 454 kg of soil. The basins sedimentcapture ability was evaluated during four sediment removal/dewatering control treatments, each designed to dewater the basin in 24 hrs. Additionally, these smallbasin sediment capture results were compared to those obtained from a 142m 3 large basin previously charged with identical hydrographs and sedigraphs. The perforated riser treatment in the small basin discharged 37.5 kg of the injected 454 kg of soil through the combined principal and emergency spillways, in comparison to 31.8 kg discharged from the large basin, where only the principal spillway was used. The skimmer treatment in the small basin discharged 26.4 kg of the injected 454 kg of soil through the combined principal and emergency spillways, in comparison to 15.0 kg discharged from the large basin. On average, the small basin discharged 150% more sediment than the large basin. The addition of trenchedin geotextile barriers oriented perpendicular to the primary flow direction in the basin did not cause a significant improvement in the capture efficiency of either basin or for either of the principal spillway configurations.