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<th rowspan=2>Constituent (concentrations reported in mg/L)</th>
 
<th rowspan=2>Constituent (concentrations reported in mg/L)</th>
 
<th colspan=5>Wisconsin Data<sup>1</sup></th>
 
<th colspan=5>Wisconsin Data<sup>1</sup></th>
<th>Twin Cities Highways<sup>2</sup></th>
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<th rowspan=2>Twin Cities Highways<sup>2</sup></th>
 
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</tr>
  

Revision as of 14:50, 30 November 2016

Urban Stormwater Quality Characteristics from Paved Surfaces

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Constituent (concentrations reported in mg/L) Wisconsin Data1 Twin Cities Highways2
Arterial Street Feeder Street Collector Street Collector Street Residential Driveway
Cadmium 0.0028 0.0008 0.0017 0.0012 0.0005 0.0025
Chromium 0.026 0.007 0.013 0.016 0.002
Copper 0.085 0.025 0.061 0.047 0.02 0.023
Lead 0.085 0.038 0.062 0.062 0.02 0.242
Zinc 0.629 0.245 0.357 0.361 0.113 0.123
Nitrate-Nitrite 0.77
Total Phosphorus 1.01 1.77 1.22 0.48 1.5 0.43
Total Dissolved Phosphorus 0.62 0.55 0.36 0.07 0.87
Chloride3 11.5
Total Suspended Solids 993 1152 544 603 328
Suspended Solids 875 1085 386 474 193

1 Arithmetic mean concentration; Reference: Roger T. Bannerman and Richard Dodds, Sources of Pollutants in Wisconsin Stormwater, 1992

2 Reference: University of Minnesota Water Resources Center, Assessment of Stormwater Best Management Practices Manual, 2008

3 Data represents chloride concentrations during monitoring season, typically April through October. Chloride concentrations in winter snowmelt grab samples have been found to be as great as 3,600 mg/L.

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