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Of course, the real world is not black and white, and it is possible to blend these categories to meet a variety of different site stormwater management objectives. The purpose of categorizing the treatment train types into design priorities is to highlight the need to consider different objectives, while recognizing that if the design priority of the treatment train is narrowly focused, objectives other than those targeted may not be met.
==Calculating Water Quality Performance of Treatment Trains==
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 moves through the treatment train. Key changes that need to be considered when calculating treatment train performance include:
===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). These facilities change not only sediment loads of sediment but also the composition of sediment loads, which has important implications for calculating performance.