Volume balance and toxicity analysis of highway storm water discharge from Cross Lake Bridge : technical summary report.

Details

• Creators:
  Griffin, D. M.
• Corporate Creators:
  Louisiana Transportation Research Center
• Corporate Contributors:
  Louisiana. Dept. of Transportation and Development
• Subject/TRT Terms:
  • Drainage basins
  • Drainage structures
  • Runoff
  • Drainage
  • Water pollution
  • Measurement
  • Urban runoff--Management
  • Runoff--Louisiana--Shreveport
  • Bridges--Drainage systems
  • Water--Pollution--Measurement
  More +
• Publication/ Report Number:
  FHWA/LA.09/447
• Resource Type:
  Tech Report
• Geographical Coverage:
  Louisiana
• Edition:
  Technical summary report.
• Corporate Publisher:
  Louisiana Transportation Research Center
• Abstract:
  The Cross Lake Bridge is approximately 10,000 feet long and spans Cross Lake. It is part of ; Interstate 220 that bypasses Shreveport, Louisiana from Interstate 20, the longest interstate ; highway in the country and heavily traveled by both car and truck traffic. Cross Lake, however, ; serves as the potable water supply for the city of Shreveport. During construction of the bridge, ; concern was expressed over the possibility of an accident on the bridge that might result in ; contamination of the city’s water supply. As a result, the Louisiana Department of ; Transportation and Development (LADOTD) agreed to modify the bridge to include a “closed” ; drainage system and to construct a concrete-lined holding pond on the east bank of the lake to ; collect and hold runoff from precipitation prior to testing and discharge. ; Previous research results found that only about 50 percent of the rainfall onto the bridge was ; reaching the pond due to leakage of the collection system on the bridge. As a result, LADOTD ; carried out repairs to the collection system, creating the need to determine the degree to which ; the repairs were successful. ; Earlier research also identified substantial levels of conventional pollutants as well as heavy ; metals in runoff from the bridge. Much of this material was sediment bound and settled to the ; bottom of the pond. Toxicity testing has become a popular means of assessing effluent quality ; in a variety of discharges, and a need was identified for an easy-to-use, rapid means of ; determining the toxicity of the pond discharge to downstream life forms.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/16956/dot_16956_DS1.pdf
• File Type:
  [PDF - 25.04 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:529cfa26d1f0f2862e81cc28a23886d7065ec3f257f12fd8dc197114b8f74c28