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→STEP stormwater practice effluent quality monitoring results
===STEP stormwater practice effluent quality monitoring results===
===STEP stormwater practice effluent quality monitoring results===
The box plot figures to the right show combined stormwater effluent quality monitoring results from STEP monitoring projects conducted over a 25-year time period (between 1997 and 2021) at sites within Greater Toronto Area municipalities.<br>
The box plot figures to the right show stormwater effluent quality monitoring results from STEP monitoring projects conducted over a 25-year time period (between 1997 and 2021) at sites within Greater Toronto Area municipalities.<br>
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Median concentrations of Total Suspended Solids (TSS) in untreated stormwater and [[Oil and Grit Separator]] (OGS) outlet locations were found to exceed the Canadian Water Quality Guideline of 30 mg/L. Median TSS concentrations at stormwater detention pond and chamber system outlet locations were found to be below 30 mg/L, but exceeded the guideline value in 36% of the 231 monitored storm events. Median TSS concentrations at bioretention, permeable pavement and infiltration trench outlet locations were found to be all below 30 mg/L. TSS concentrations in effluent from bioretention was found to exceed 30 mg/L in only 15% of the 301 monitored storm events, and in only 12% of the 296 monitored events for permeable pavements.<br>
Median concentrations of Total Suspended Solids (TSS) in untreated stormwater and [[Oil and Grit Separator]] (OGS) outlet locations were found to exceed the Canadian Water Quality Guideline of 30 mg/L. Median TSS concentrations at stormwater detention pond and chamber system outlet locations were found to be below 30 mg/L, but exceeded the guideline value in 36% of the 231 monitored storm events. Median TSS concentrations at bioretention, permeable pavement and infiltration trench outlet locations were found to be all below 30 mg/L. TSS concentrations in effluent from bioretention was found to exceed 30 mg/L in only 15% of the 301 monitored storm events, and in only 12% of the 296 monitored events for permeable pavements.<br>