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→1. Changes in the composition of runoff, especially the size distribution of sediment particles
The performance of a treatment train will vary based on the type of stormwater treatment practices implemented and their arrangement within the treatment train. Various changes occur as [[Runoff volume control targets|runoff]] moves through the treatment train. Key changes that need to be considered when [[Low impact development treatment train tool|calculating treatment train performance]] including:
The performance of a treatment train will vary based on the type of stormwater treatment practices implemented and their arrangement within the treatment train. Various changes occur as [[Runoff volume control targets|runoff]] moves through the treatment train. Key changes that need to be considered when [[Low impact development treatment train tool|calculating treatment train performance]] including:
===1. Changes in the composition of runoff, especially the [[Grain size analysis|size distribution of sediment particles]]===
===1. Changes in the composition of runoff, especially the size distribution of sediment particles===
Stormwater facilities are often designated as providing enhanced (80% TSS removal) or basic treatment (50 to 60% TSS removal) based on their capacity to remove fine particles (MOE, 2003)<ref>Ministry of Environment. 2003. Stormwater Management Planning and Design Manual. March 2003. Copyright: Queen’s Printer for Ontario, 2003. ISBN 0-7794-2969-9. PIBS 4329e. Accessed: https://www.ontario.ca/document/stormwater-management-planning-and-design-manual-0.</ref>. These facilities change not only sediment loads of sediment but also the composition of sediment loads, which has important implications for calculating performance.
Stormwater facilities are often designated as providing enhanced (80% TSS removal) or basic treatment (50 to 60% TSS removal) based on their capacity to remove fine particles (MOE, 2003)<ref>Ministry of Environment. 2003. Stormwater Management Planning and Design Manual. March 2003. Copyright: Queen’s Printer for Ontario, 2003. ISBN 0-7794-2969-9. PIBS 4329e. Accessed: https://www.ontario.ca/document/stormwater-management-planning-and-design-manual-0.</ref>. These facilities change not only sediment loads of sediment but also the composition of sediment loads, which has important implications for calculating performance.