Skip to main content

Table 4 Comparison of measured versus theoretical loadings per catchment for the sampled 2019 ice-free SW season (June–August)

From: Assessment of stormwater discharge contamination and toxicity for a cold-climate urban landscape

  Land use area (km2) Seasonal SW volume (103 m3) Measured seasonal loading (kg) Theoretical seasonal loading (kg)
TSS COD Cu Ni Pb Zn PAHs TSS COD Cu Ni Pb Zn PAHs
Wanuskewin Rd 25.5 1216 264,330 ± 211,021 565,293 ± 450,796 48.9 ± 50.5 8.15 ± 14.1 1.55 ± 1.61 546 ± 120 0.77 ± 0.52 345,189 ± 250,796 156,735 ± 67,511 121 ± 81.6 39.2 ± 12.4 224 ± 204 428 ± 294 1.09 ± 0.31
SCB E 24.6 1567 350,679 ± 197,142 443,541 ± 498,276 68.5 ± 76.1 13.6 ± 23.5 2.66 ± 1.76 375 ± 200 3.10 ± 3.73 362,769 ± 258,577 167,340 ± 71,554 109 ± 68.0 41.3 ± 14.9 214 ± 193 453 ± 313 1.33 ± 0.34
SCB W 9.58 757 38,158 ± 22,205 124,225 ± 97,227 54.0 ± 55.7 1.39 ± 1.43 3.55 ± 2.31 143 ± 80.6 0.59 ± 0.38 194,226 ± 138,684 89,451 ± 36,241 61.8 ± 35.6 21.3 ± 8.76 119 ± 106 239 ± 173 0.69 ± 0.04
17th St. W. 8.99 697 330,369 ± 286,392 655,420 ± 611,534 26.7 ± 17.1 5.13 ± 5.57 1.49 ± 0.73 118 ± 25.3 0.43 ± 0.46 125,815 ± 89,836 60,563 ± 24,537 38.5 ± 22.2 15.3 ± 6.3 74.5 ± 66.2 165 ± 119 0.47 ± 0.03
14th St. E. 3.18 223 53,097 ± 43,049 109,903 ± 121,122 7.58 ± 7.84 1.05 ± 1.24 0.42 ± 0.16 42.4 ± 12.1 0.17 ± 0.15 45,586 ± 32,256 22,174 ± 9,280 13.0 ± 7.84 5.64 ± 2.08 25.6 ± 23.1 58 ± 40.2 0.17 ± 0.02
MacPherson Ave 1.47 103 23,642 ± 22,043 60,653 ± 69,697 4.25 ± 4.84 0.52 ± 0.72 0.14 ± 0.05 22.0 ± 9.29 0.05 ± 0.7 21,073 ± 15,614 10,250 ± 4,724 6.0 ± 4.24 2.61 ± 0.75 11.9 ± 11.0 27 ± 17.7 0.08 ± 0.00
23rd St. W. 2.73 259 135,986 ± 110,662 160,338 ± 204,452 13.9 ± 15.4 3.54 ± 6.13 0.53 ± 0.24 54.9 ± 38.6 0.47 ± 0.17 63,584 ± 47,564 29,467 ± 11,253 21.7 ± 16.1 7.26 ± 1.23 40.5 ± 37.3 79 ± 56.9 0.22 ± 0.14
  1. Measured seasonal loading was calculated by averaging measured concentrations of the indicated parameters to obtain a seasonal mean concentration per catchment. Seasonal SW volumes were calculated from local rain gauge data (see “Methods” and “Land use management” sections). Mass loading values were obtained using estimated seasonal runoff and compared to the sums of theoretical catchment loads. Parameters were selected for direct comparison with theoretical values