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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 whisker plot figures to the right show stormwater effluent quality monitoring results from STEP monitoring projects over a 25-year period (1997 - 2021) for sites within Greater Toronto Area regions and municipalities. Median concentrations of Total Suspended Solids (TSS) in untreated stormwater and oil and grit separator (OGS) outlet locations were found to typically exceed 30 mg/L. Median TSS concentrations at stormwater detention pond and chamber system outlet locations was found to be below 30 mg/L, but exceeded the guideline value in 36% of the monitored storm events. Median TSS concentrations at bioretention, permeable pavement and infiltration trench outlet locations were all below 30 mg/L. TSS concentration in effluent from bioretention was found to exceed 30 mg/L in only 15% of the monitored storm events, and in only 12% of monitored events for permeable pavements.
The whisker 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. Median concentrations of Total Suspended Solids (TSS) in untreated stormwater and oil and grit separator (OGS) outlet locations were found to typically exceed 30 mg/L. Median TSS concentrations at stormwater detention pond and chamber system outlet locations was found to be below 30 mg/L, but exceeded the guideline value in 36% of the 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. It is notable that infiltration trench results are from only one site and based on a relatively small number of storm events (25).
Click on the links below for LID BMP-specific pages and figures.
Click on the links below for LID BMP-specific pages and figures.