According to the definition of the PFF, the first flushes of particles in the different size categories (<10, 10–20, 20–45, 45–75, and >75 μm) were analyzed, and the fitting M(v) curves are illustrated in Figure 4. The strength of the first flush was quantified with the b-value method (Table 2).
Table 2

The b values of particles in the different size categories in runoff from the AR, MR, and CR

Event MM/DDSS< 10 μm10–20 μm20–45 μm45–75 μm> 75 μm
AR 06/09 0.66 0.45 0.59 0.67 0.58 1.12 
07/05 0.73 0.62 0.66 7.59 6.93 5.84 
07/29 0.52 0.48 0.81 0.75 0.46 0.51 
08/23 0.93 0.52 2.78 1.65 3.91 2.70 
Average 0.71 ± 0.17 0.52 ± 0.07 1.21 ± 1.05 2.67 ± 3.31 2.97 ± 3.09 2.54 ± 2.38 
MR 06/09 1.17 0.92 1.17 1.58 1.37 1.12 
07/05 0.61 0.59 0.62 1.03 1.03 - 
07/29 0.32 0.53 0.13 0.11 0.34 0.44 
08/23 0.81 0.91 0.68 0.74 0.84 0.92 
Average 0.73 ± 0.36 0.74 ± 0.21 0.65 ± 0.42 0.86 ± 0.61 0.89 ± 0.43 0.83 ± 0.35 
CR 06/09 0.82 0.71 0.84 0.99 1.05 1.04 
07/05 0.58 0.54 0.56 0.70 0.70 - 
07/29 0.53 0.32 0.13 0.19 0.85 0.80 
08/23 0.64 0.73 0.56 0.56 0.45 0.63 
Average 0.64 ± 0.13 0.58 ± 0.19 0.52 ± 0.29 0.61 ± 0.33 0.76 ± 0.26 0.82 ± 0.21 
Event MM/DDSS< 10 μm10–20 μm20–45 μm45–75 μm> 75 μm
AR 06/09 0.66 0.45 0.59 0.67 0.58 1.12 
07/05 0.73 0.62 0.66 7.59 6.93 5.84 
07/29 0.52 0.48 0.81 0.75 0.46 0.51 
08/23 0.93 0.52 2.78 1.65 3.91 2.70 
Average 0.71 ± 0.17 0.52 ± 0.07 1.21 ± 1.05 2.67 ± 3.31 2.97 ± 3.09 2.54 ± 2.38 
MR 06/09 1.17 0.92 1.17 1.58 1.37 1.12 
07/05 0.61 0.59 0.62 1.03 1.03 - 
07/29 0.32 0.53 0.13 0.11 0.34 0.44 
08/23 0.81 0.91 0.68 0.74 0.84 0.92 
Average 0.73 ± 0.36 0.74 ± 0.21 0.65 ± 0.42 0.86 ± 0.61 0.89 ± 0.43 0.83 ± 0.35 
CR 06/09 0.82 0.71 0.84 0.99 1.05 1.04 
07/05 0.58 0.54 0.56 0.70 0.70 - 
07/29 0.53 0.32 0.13 0.19 0.85 0.80 
08/23 0.64 0.73 0.56 0.56 0.45 0.63 
Average 0.64 ± 0.13 0.58 ± 0.19 0.52 ± 0.29 0.61 ± 0.33 0.76 ± 0.26 0.82 ± 0.21 
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Figure 4
First flush of particles in the different size categories (<10, 10–20, 20–45, 45–75, and >75 μm) in the runoff from the AR, MR, and CR.
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First flush of particles in the different size categories (<10, 10–20, 20–45, 45–75, and >75 μm) in the runoff from the AR, MR, and CR.

Figure 4
First flush of particles in the different size categories (<10, 10–20, 20–45, 45–75, and >75 μm) in the runoff from the AR, MR, and CR.
View largeDownload slide

First flush of particles in the different size categories (<10, 10–20, 20–45, 45–75, and >75 μm) in the runoff from the AR, MR, and CR.

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