Evaluating sediment capture rates for different sediment basin designs.

Details

• Creators:
  McLaughlin, Richard A. ; Markusic, Melanie S.
• Corporate Creators:
  North Carolina State University. Soil Science Dept.
• Corporate Contributors:
  North Carolina. Dept. of Transportation. Research and Analysis Group
• Subject/TRT Terms:
  • Sedimentation
  • Deposition
  • Drainage structures
  • Catch basins
  • Sediment control--North Carolina
  • Sedimentation and deposition--North Carolina
• Publication/ Report Number:
  FHWA/NC/2006-49
• Resource Type:
  Tech Report
• Geographical Coverage:
  North Carolina
• Edition:
  Final report; July 2005-June 2007.
• Corporate Publisher:
  North Carolina. Dept. of Transportation
• Abstract:
  The effectiveness of sediment control devices was studied on a large NC DOT project to determine the ; effects of different designs and conditions. Flow and sediment content of water exiting six different traps ; and basins were measured and the amount of sediment trapped estimated from periodic surveys. Sediment ; trapping and discharges strongly suggested that commonly used designs are relatively ineffective. The three ; devices with rock dam outlets had sediment retention of <57% of sediment entering the traps and discharged ; up to 20 t ac-1 during up to 12 months of monitoring. In contrast, the skimmer basins with surface outlets, ; stable sides and inlets, and porous baffles, retained more that 90% of sediment entering them, as long as they ; were properly maintained. While the skimmer basins retained most of the sediment entering it, the ; discharges were still relatively turbid and contained considerable suspended solids. The skimmer basin ; which was monitored longest (one year) had average turbidity of 891 nephelpmetric turbidity units (NTU) ; and total suspended solids (TSS) of 537 mg L-1. It is likely that the remaining suspended materials are very ; fine and will not settle by gravity alone under typical retention times. The more efficient designs tended to ; retain more of the coarse fraction entering the basins than the less efficient designs. The improvement in ; sediment retention with the design improvements will significantly reduce the impacts of land disturbances ; from construction activity on water quality in nearby streams.
  More +
• Format:
  PDF
• Funding:
  98-1783
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/17777/dot_17777_DS1.pdf
• File Type:
  [PDF - 484.30 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:b8103ae5b17a0b0eed7018cae8caf305fbd9463203afba6d04db6347e8cc8aee