Parameters AT (°C) WT (°C) Salinity pH DO BOD (mg/l) COD (mg/l) µM
Month (‰) (mg/l) NH4 TN TP SiO3
January 31 31.5 32.5 8.1 4.87 0.198 0.259 2.213 13.18 2.047 2.418
February 29.5 30.5 31.5 8.1 3.09 0.673 0.267 1.147 18.93 2.356 2.514
March 30 31 32 8 3.81 1.547 0.951 1.892 12.91 1.732 3.245
April 30.5 31.5 34.5 8.1 0.963 2.632 0.263 1.245 21.54 0.514 2.148
May 32 32.5 35 8.2 0.487 2.487 0.384 2.092 20.82 0.621 2.169
June 31.5 31 33.5 7.8 0.362 3.015 0.568 1.634 18.36 2.179 1.923
Table 5: Water quality parameters in Pichavaram during from January 2011 to June 2011.