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Conversely, the woven Amoco fabric had the lowest TSS removal efficiencies and the
shortest detention times.
The detention times plotted against the TSS removal efficiency for each test are
presented in Figure 5.6. A correlation between T d and TSS removal efficiency is
apparent. Lower flow rates results in increased detention times and increased solids
removal efficiency.
Table 5.6 TSS Removal Efficiencies, %
Control Mean Median Std. Dev. Range
Belton w 70 72 13 46-82
Exxon w 90 87 6 84-97
Mirafi nw 90 93 11 73-99
Amoco w 68 68 3 65-73
Rock Berm 42 42 7 36-49
100
TSS Removal Efficiency, %
80
60
40
20
Belton w
Exxon w
Mirafi A nw
Mirafi B nw
Amoco w
Rock Berm
0
10 100 1000 10000 100000
Detention Times, min
Figure 5.6 TSS Removal Efficiency as a Function of Detention Time
The longest detention times in this series of tests were observed for the Mirafi A
fabric even though this fabric had the highest reported permittivity (Table 5.4). This
fabric also had the smallest apparent opening size, suggesting that clogging of the fabric
with sediment was responsible for the unexpected hydraulic performance. This
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