Changes

Simple treatment train equations that apply the pollutant removal efficiency of the downstream treatment practice to the fraction of load remaining after passing through the upstream treatment practice, or those that assign downstream practices half the removal efficiency of the upstream practice '''are not recommended'''.  Instead, the configuration and type of treatment train should be considered on a case by case basis, with consideration for changes in influent runoff concentration/composition and runoff volume as water drains through the different practices.  Some examples are provided in the sections below.

Simple treatment train equations that apply the pollutant removal efficiency of the downstream treatment practice to the fraction of load remaining after passing through the upstream treatment practice, or those that assign downstream practices half the removal efficiency of the upstream practice '''are not recommended'''.  Instead, the configuration and type of treatment train should be considered on a case by case basis, with consideration for changes in influent runoff concentration/composition and runoff volume as water drains through the different practices.  Some examples are provided in the sections below.

====Treatment trains without runoff volume reduction====

==Treatment trains without runoff volume reduction==

As noted above, non-infiltrating stormwater facilities are often designated as enhanced or basic treatment based on their capacity to remove total suspended solids (TSS).  Enhanced level facilities are credited with 80% TSS removal while basic level facilities are credited with 60% TSS removal or less.   

As noted above, non-infiltrating stormwater facilities are often designated as enhanced or basic treatment based on their capacity to remove total suspended solids (TSS).  Enhanced level facilities are credited with 80% TSS removal while basic level facilities are credited with 60% TSS removal or less.