84
Table 6.16 Monthly and seasonal values of biological oxygen demand (BOD) at various stations of River Vishwamitri
during 2002–2004
Sites
Biological oxygen demand (mg/L)
Month
Season
Station I
March
16.20 ± 1.30*
Summer
17.90 ± 2.13*
April
19.60 ± 1.14
May
Dry
August
8.40 ± 1.14
Post-monsoon
9.47 ± 1.36
September
9.40 ± 1.14
October
10.60 ± 0.89
December
9.40 ± 1.67
Winter
11.24 ± 1.94
January
11.04 ± 0.62
February
13.28 ± 0.73
Station II
March
Dry
Summer
Dry
April
Dry
May
Dry
August
31.20 ± 1.64
Post-monsoon
35.47 ± 5.24
September
33.20 ± 2.17
October
42.00 ± 2.45
December
26.40 ± 1.67
Winter
26.40 ± 1.67
January
Dry
February
Dry
Station III
March
98.80 ± 2.28
Summer
117.20 ± 16.02
April
116.80 ± 2.39
May
136.00 ± 4.69
August
60.20 ± 2.86
Post-monsoon
92.15 ± 30.39
September
85.84 ± 2.75
October
130.80 ± 4.15
December
74.00 ± 2.92
Winter
107.07 ± 29.13
January
104.80 ± 3.70
February
142.40 ± 3.85
Station IV
March
222.80 ± 4.60
Summer
246.93 ± 21.82
April
245.80 ± 5.59
May
272.20 ± 9.31
August
92.40 ± 3.29
Post-monsoon
140.13 ± 51.63
September
119.40 ± 3.97
October
208.60 ± 7.54
December
170.40 ± 6.23
Winter
176.40 ± 14.86
January
163.60 ± 4.56
February
195.20 ± 4.60
Station V
March
263.80 ± 6.80
Summer
324.40 ± 64.18
April
301.20 ± 8.32
May
408.20 ± 16.19
August
178.00 ± 5.83
Post-monsoon
220.80 ± 42.08
September
209.80 ± 6.87
October
274.60 ± 7.54
December
235.40 ± 5.18
Winter
261.33 ± 33.18
January
242.80 ± 5.40
February
305.80 ± 7.50
*Values are expressed as mean ± SD
S. Dhuru et al.