Parameters Weight (wi) Unit weight (Wi) Quality rating (qi) Sub index( SIi) QI
pH 4 0.235 120.57 28.33  
DO 4 0.235 138.33 32.50  
BOD5 3 0.176 014.00 02.46  
MPN 4 0.235 040.00 09.40  
TDS 2 0.117 024.48 02.86  
  ∑wi =17 ∑Wi =0.998   ∑ SIi =75.55 75.55
Table 4: Quality index for Tenughat Dam.