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Table 2

Laboratory studies on different OGSs

Parameter	Downstream Defender (Faram 2000)	Stormceptor STC 900 (Imbrium Systems Corporation 2004)	Stormceptor OSR 250 (Imbrium Systems Corporation 2007)	Skimpro OGS (Sturm et al. 2007)	CDS (FB Environmental Associates 2010)	Vortech 2000 (Contech Engineered Solutions 2015)	Downstream Defender Hydro (ETV 2016)	Stormceptor EF4 (ETV 2017)
Type	Swirl action	Gravity action	Gravity action	Gravity action	Swirl and screening action	Gravity action	Swirl action	Gravity action
Q (L/s)	2.5–17.5	4.4–22	17.6–88.3	21–86	3.4–50	2.3–21	3.7–166.6	0.75–35.6
h (m)	1.25	1.4	1.4	1.3	1.44	1.3	1.8	1.5
A (m²)	1.13	2.63	4.67	4.6	1.82	3.71	5.55	1.13
d₅₀ (mm)	0.30	0.067	0.108	0.12, 0.17, 0.30	0.108	0.050, 0.080, 0.150	0.62^a	0.62^a

Parameter	Downstream Defender (Faram 2000)	Stormceptor STC 900 (Imbrium Systems Corporation 2004)	Stormceptor OSR 250 (Imbrium Systems Corporation 2007)	Skimpro OGS (Sturm et al. 2007)	CDS (FB Environmental Associates 2010)	Vortech 2000 (Contech Engineered Solutions 2015)	Downstream Defender Hydro (ETV 2016)	Stormceptor EF4 (ETV 2017)
Type	Swirl action	Gravity action	Gravity action	Gravity action	Swirl and screening action	Gravity action	Swirl action	Gravity action
Q (L/s)	2.5–17.5	4.4–22	17.6–88.3	21–86	3.4–50	2.3–21	3.7–166.6	0.75–35.6
h (m)	1.25	1.4	1.4	1.3	1.44	1.3	1.8	1.5
A (m²)	1.13	2.63	4.67	4.6	1.82	3.71	5.55	1.13
d₅₀ (mm)	0.30	0.067	0.108	0.12, 0.17, 0.30	0.108	0.050, 0.080, 0.150	0.62^a	0.62^a

^aAnalyses were based on different sediment fractions instead of d₅₀.