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Line 311:
Line 311: − − To assess whether a SWMF needs sediment removal, three factors are required: − *Current storage capacity (from sediment depth measurements or TSS load modelling). − *Minimum efficiency allowed (5% reduction, per MOE 2003). − *The facility’s efficiency–storage relationship, to compare storage loss with the 5% efficiency threshold.
→Performance
Dry ponds may include a deep pool in the sediment forebay to minimize scour and sediment resuspension, but the main basin does not retain a permanent pool of water. As a result, contaminants cannot settle between storm events, nor is there dilution of pollutants during storms. Consequently, while dry ponds are effective for [[Erosion|erosion]] and flood control, they may need to be paired with other LID features in a [[Treatment train|treatment train]] to improve water quality beyond the basic treatment level of 60% long-term TSS removal (MOE, 2003)<ref name="MOE"></ref>.
Dry ponds may include a deep pool in the sediment forebay to minimize scour and sediment resuspension, but the main basin does not retain a permanent pool of water. As a result, contaminants cannot settle between storm events, nor is there dilution of pollutants during storms. Consequently, while dry ponds are effective for [[Erosion|erosion]] and flood control, they may need to be paired with other LID features in a [[Treatment train|treatment train]] to improve water quality beyond the basic treatment level of 60% long-term TSS removal (MOE, 2003)<ref name="MOE"></ref>.
==Modeling==
==Modeling==