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<center><font size=3>'''Typical Annual and Snowmelt Urban Stormwater Quality Characteristics'''</font size><br>
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<font size=3>'''Typical Annual and Snowmelt Urban Stormwater Quality Characteristics'''</font size><br>
 
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Link to this [[Typical Annual and Snowmelt Urban Stormwater Quality Characteristics|table]]
Link to this [[Typical Annual and Snowmelt Urban Stormwater Quality CharacteristicsT|table]]</center>
 
  
 
<table class="sortable">
 
<table class="sortable">

Revision as of 14:51, 2 November 2016

Typical Annual and Snowmelt Urban Stormwater Quality Characteristics
Link to this table

Constituent (concentrations reported in mg/L) Annual Twin Cities Snowbelt4
Twin Cities1 Marquette MI2 Madison WI Storm Sewers Open Channels Creeks NURP5
Biological OxygConen Demand 15
Chemical Oxygen Demand 169 66 169 82 84 91
Total Kjeldahl Nitrogen 2.62 1.50 3.52 2.36 3.99 2.35
Nitrate + Nitrite 0.53 0.37 1.04 0.89 0.65 0.96
Ammonia 0.2
Total Phosphorus 0.58 0.29 0.66 0.7 0.56 0.54 0.46
Dissolved Phosphorus 0.20 0.04 0.27 0.25 0.18 0.16
Chloride3 230 49 116
Total Suspended Solids 184 159 262 148 88 64
Volatile Suspended Solids 66 46 15

1 Event mean concentrations; Reference: Brezonik and Stadelmann 2002

2 Geometric mean concentrations; Reference: Steuer et al. 1997

3 Geometric mean concentrations; Reference: Waschbusch et al. 1999

4 Reference: Oberts, G. (Met Council). 2000. Influence of Snowmelt Dynamics on Stormwater Runoff Quality.

5 Reference: Median concentrations from more than 2,300 rainfall events monitored across the nation; EPA, 1983

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