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:
  Catch Basins Deposition Drainage Structures Sedimentation Sedimentation And Deposition--North Carolina Sediment Control--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.
  
  
• Format:
  PDF
• Funding:
  98-1783
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:b8103ae5b17a0b0eed7018cae8caf305fbd9463203afba6d04db6347e8cc8aee
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/17777/dot_17777_DS1.pdf
• File Type:
  [PDF - 484.30 KB ]