Kumar et al.,
South West Monsoon
301.08
571.00
139.50
103.03
0.34
0.533
0.110
0.585
North East Monsoon
307.36
933.50
68.60
192.56
0.63
1.668
3.194
0.145
Winter
12.51
69.10
0.00
21.30
1.70
1.723
1.671
-0.147
Summer
120.59
232.20
32.00
55.65
0.46
0.255
-0.455
0.121
Weaverly
Annual
1760.5
4767.10
0.00
1006.33
0.57
0.602
0.518
0.112
South West Monsoon
1167.2
3834.00
0.00
766.87
0.66
1.170
2.463
0.982
North East Monsoon
382.4
1025.00
0.00
246.34
0.64
0.626
-0.169
0.765
Winter
21.8
303.50
0.00
55.82
2.56
4.743
24.117
-0.153
Summer
189.1
495.00
0.00
133.69
0.71
0.706
-0.217
0.053
Table 2. Summary of the Mann-Kendall analysis
Rainfall Series
Rain-gauge Station
Annual
SWM
NEM
Winter
Summer
Aliyar Nagar
2.11*
1.22
1.77
0.40
0.99
Anamalai
1.41
0.08
1.68
0.00
1.07
Attakatti
2.31*
1.87
2.14*
0.14
1.80
Chinnakallar
3.03
2.89
0.88
0.59
2.72
Pollachi
1.53
-0.61
1.85
0.38
1.97*
Topslip
-0.65
-1.87
0.54
0.29
0.20
Vettaikaranpudur
0.37
-0.68
1.22
0.17
0.71
Weaverly
1.70
1.43
2.48*
1.90
3.16
* existence of a trend with level of significance α = 0.05
Table 3. Sen’s estimator of slope for rainfall
Aliyar Nagar
Anamalai
Attakatti
Chinnakallar
Rainfall Series
Slope
Constant
Slope
Constant
Slope
Constant
Slope
Constant
Annual
10.95
694.05
16.07
3331.17
21.36
824.45
90.51
3502.36
SWM
3.46
223.09
2.00
2530.00
9.00
356.80
74.69
2533.93
NEM
6.79
252.35
7.91
417.41
9.37
334.57
6.32
611.72
Winter
0.00
6.00
0.00
9.00
0.00
7.10
0.00
5.50
Summer
1.70
105.40
4.38
229.48
3.26
86.54
11.36
168.71
Pollachi
Topslip
Vettaikaranpudur
Weaverly
Rainfall Series
Slope
Constant
Slope
Constant
Slope
Constant
Slope
Constant
Annual
6.70
692.00
-3.53
1420.18
1.96
686.68
32.66
1074.98
SWM
-1.37
383.60
-8.60
857.20
-1.84
337.58
17.10
740.50
NEM
5.44
188.67
2.67
318.00
3.13
215.07
11.56
138.78
Winter
0.00
3.00
0.00
4.00
0.00
0.00
0.31
0.00
Summer
2.43
92.42
0.42
127.94
0.85
101.29
8.47
32.05
46