13.4 Results and Discussion
215
Table 13.1
Tunnel and catchment flow start time and duration
Date
Rainfall (mm)
Flow start time after rainfall (min)
Flow duration (min)
T1
T2
T3
T4
T5
T6
S1
C
T1
T2
T3
T4
T5
T6
S1
C
1989-08-06
24.8
10
16
4
8.7
13
5
M
13
25
29
58
32
31
41
M
61
1989-08-10
13.1 N
N
N
N
N
N
N
M
25
N
N
N
N
N
N
M
25
1989-08-15
28.7
21.4
4.2
18
17.5
M
20
M
15
21
41
37
45
M
40
M
165
1989-08-16
29.1
N
N
N
N
N
N
M
10
N
N
N
N
N
N
M
445
1990-07-06
21
N
N
N
N
N
N
110
M
N
N
N
N
N
N
7
M
1990-07-07
9.5
12
15
13
12
M
23
13
3
11
10
7
6
M
9
17
34
1990-07-11
39.7
15
8
11
14
8
17
12
11
37
9
96
51
M
57
56
96
1990-07-13
28.5
49
29
59
12
29
15
52
27
31
14
M
28
M
45
51
60
1990-07-22
18.2
67
40
M
30
20
10
73
12
51
41
71
55
M
57
56
96
1990-07-26a
33.3
19
1.0
9
11
8
17
6
7
60
46
103
120
50
48
108
105
1990-07-26b
19.8
M
M
M
M
M
18
M
6
M
M
M
M
M
27
M
141
1990-07-30
15.8
M
22
30
25
M
12
15
17
M
25
26
29
M
29
34
60
1990-08-11
20.2
20
17
23
20
M
20
18.3
21
24
21
32
28
M
39
36
53
1990-08-13
35.4
M
29
M
13
M
15
21
M
M
40
M
77
M
52
38
M
1990-08-28
53
13
15
23
17
M
15
M
20
62
42
92
83
M
41
42
63
Notes
T
= tunnel system; S
= surface plot; C
= catchment outlet; M
= missed events; N
= no runoff occurs