From: Revisiting Design Criteria for Stormwater Treatment Systems, Part 2
Table One
a. At influent TSS less than 100 mg/L, the requirement is effluent of 20 mg/L.
b. The incremental increases in loading is to be reduced by 80%. The goal of other manuals is usually 80% reduction in the concentration or loading of TSS for the water that is treated up to and including the design storm irrespective of the predeveloped concentration or loading.
c. No specific goal is established; rather, removal expectations are provided for each type of system, ranging from 10% to 65%.
d. Capture and treat the complete volume of 80% of the storms, representing small and moderate-size storms, while treating a portion of the larger storms.
e. For 100% impervious surface. In most manuals, maximum storm depth captured or sizing storm decreases with increase in previous surface fraction. With the exception of Washington, the volume treated by the sand filter is the same as the volume calculated for an extended detention basin.
f. Varies with the extent of the development of the site prior to the current development.
g. Implied in the sizing equation.
January-February 2005
From: Revisiting Design Criteria for Stormwater Treatment Systems, Part 2
Table One
a. At influent TSS less than 100 mg/L, the requirement is effluent of 20 mg/L.
b. The incremental increases in loading is to be reduced by 80%. The goal of other manuals is usually 80% reduction in the concentration or loading of TSS for the water that is treated up to and including the design storm irrespective of the predeveloped concentration or loading.
c. No specific goal is established; rather, removal expectations are provided for each type of system, ranging from 10% to 65%.
d. Capture and treat the complete volume of 80% of the storms, representing small and moderate-size storms, while treating a portion of the larger storms.
e. For 100% impervious surface. In most manuals, maximum storm depth captured or sizing storm decreases with increase in previous surface fraction. With the exception of Washington, the volume treated by the sand filter is the same as the volume calculated for an extended detention basin.
f. Varies with the extent of the development of the site prior to the current development.
g. Implied in the sizing equation.