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Table 7

Water pollution indices between the dry season and rainy season of Cau River

IndexValueEntire river
Upstream
Midstream
Downstream
Dry seasonRainy seasonDry seasonRainy seasonDry seasonRainy seasonDry seasonRainy season
CPI Min–Max 0.50–1.57 0.66–1.37 0.50–0.81 0.91–1.06 0.93–1.30 0.66–0.84 1.02–1.57 0.95–1.37 
Ave ± SD 1.08 ± 0.32 0.96 ± 0.21 0.67 ± 0.12*** 0.97 ± 0.07*** 1.10 ± 0.12 0.73 ± 0.06 1.32 ± 0.34* 1.14 ± 0.17* 
OPI Min–Max 0.42–2.91 0.51–2.32 0.42–1.51 0.51–0.76 0.70–1.92 0.60–1.04 1.72–2.91 1.46–2.32 
Ave ± SD 1.55 ± 0.65* 1.18 ± 0.60* 0.92 ± 0.38 0.63 ± 0.08 1.35 ± 0.40*** 0.79 ± 0.16*** 2.12 ± 0.14 1.83 ± 0.30 
EI Min–Max 56.47–587.86 72.69–603.07 56.47–242.54 72.69–97.82 86.35–402.63 73.22–139.09 260.34–587.86 202.45–603.07 
Ave ± SD 268 ± 156.27* 188 ± 139.81* 128.57 ± 66.61 85.54 ± 10.31 224.49 ± 117.81** 101.64 ± 24.60** 394.79 ± 128.82 322.84 ± 126.24 
TPI Min–Max 0.39–0.49 0.39–0.42 0.39–0.40 0.40–0.42 0.40–0.44 0.39–0.40 0.40–0.49 0.40–0.42 
Ave ± SD 0.41 ± 0.02 0.40 ± 0.01 0.39 ± 0.003*** 0.41 ± 0.01*** 0.41 ± 0.02** 0.40 ± 0.003** 0.42 ± 0.03 0.41 ± 0.01 
IndexValueEntire river
Upstream
Midstream
Downstream
Dry seasonRainy seasonDry seasonRainy seasonDry seasonRainy seasonDry seasonRainy season
CPI Min–Max 0.50–1.57 0.66–1.37 0.50–0.81 0.91–1.06 0.93–1.30 0.66–0.84 1.02–1.57 0.95–1.37 
Ave ± SD 1.08 ± 0.32 0.96 ± 0.21 0.67 ± 0.12*** 0.97 ± 0.07*** 1.10 ± 0.12 0.73 ± 0.06 1.32 ± 0.34* 1.14 ± 0.17* 
OPI Min–Max 0.42–2.91 0.51–2.32 0.42–1.51 0.51–0.76 0.70–1.92 0.60–1.04 1.72–2.91 1.46–2.32 
Ave ± SD 1.55 ± 0.65* 1.18 ± 0.60* 0.92 ± 0.38 0.63 ± 0.08 1.35 ± 0.40*** 0.79 ± 0.16*** 2.12 ± 0.14 1.83 ± 0.30 
EI Min–Max 56.47–587.86 72.69–603.07 56.47–242.54 72.69–97.82 86.35–402.63 73.22–139.09 260.34–587.86 202.45–603.07 
Ave ± SD 268 ± 156.27* 188 ± 139.81* 128.57 ± 66.61 85.54 ± 10.31 224.49 ± 117.81** 101.64 ± 24.60** 394.79 ± 128.82 322.84 ± 126.24 
TPI Min–Max 0.39–0.49 0.39–0.42 0.39–0.40 0.40–0.42 0.40–0.44 0.39–0.40 0.40–0.49 0.40–0.42 
Ave ± SD 0.41 ± 0.02 0.40 ± 0.01 0.39 ± 0.003*** 0.41 ± 0.01*** 0.41 ± 0.02** 0.40 ± 0.003** 0.42 ± 0.03 0.41 ± 0.01 

CPI, Comprehensive Pollution Index; OPI, Organic Pollution Index; EI, Eutrophication Index; TPI, Trace Heavy Metal Index. (*), (**), (***) = significant difference at 0.1, 0.05 and 0.01 levels.

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