Geoscience Reference
In-Depth Information
Table 6.1
Values from the frequency analysis of daily mean flow on the upper Wye
catchment. These values form the basis of the flow duration curve in Figure 6.7
Daily mean flow (m
3
/s)
Frequency
Relative frequency (%)
Cumulative frequency (%)
0-0.05
250
2.65
100.00
0.05-0.1
923
9.78
97.35
0.1-0.15
927
9.82
87.57
0.15-0.2
814
8.63
77.75
0.2-0.25
708
7.50
69.12
0.25-0.3
589
6.24
61.62
0.3-0.4
881
9.34
55.38
0.4-0.5
641
6.79
46.04
0.5-0.7
958
10.15
39.25
0.7-1.0
896
9.49
29.10
1.0-1.3
553
5.86
19.60
1.3-1.6
357
3.78
13.74
1.6-1.9
222
2.35
9.96
1.9-2.1
117
1.24
7.61
2.1-2.4
127
1.35
6.37
2.4-2.7
103
1.09
5.02
2.7-3.0
71
0.75
3.93
3.0-3.3
47
0.50
3.18
3.3-3.6
42
0.45
2.68
3.6-3.9
34
0.36
2.24
3.9-4.2
33
0.35
1.88
4.2-4.5
28
0.30
1.53
4.5-5.0
28
0.30
1.23
5.0-5.5
23
0.24
0.93
5.5-6.0
23
0.24
0.69
6.0-6.5
14
0.15
0.45
6.5-7.0
7
0.07
0.30
7.0-7.5
7
0.07
0.22
7.5-8.0
3
0.03
0.15
8.0-8.5
4
0.04
0.12
8.5-9.0
2
0.02
0.07
9.0-9.5
1
0.01
0.05
9.5-10.0
3
0.03
0.04
> 10.0
1
0.01
0.01
Total
9,437
100
Table 6.2
Summary flow statistics derived from the flow duration curve for the Wye
catchment
Flow statistic
Ln flow (m
3
/s)
Flow (m
3
/s)
Q
95
-2.48
0.084
Q
50
-0.78
0.458
Q
10
0.56
1.75
