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Table 4 Parameters for membership functions of the different indicators used in the MFWQI

From: River water quality index for Morocco using a fuzzy inference system

  DO BOD5 COD
a b c d a b c d a b c d
Excellent 7 7 11 20 0 0 1.8 3 0 0 20 30
Good 4 5 7 7 1.8 3 5 - 20 25 30 35
Average 2 3 4 5 3.1 4.3 5 10 25 35 40 -
Poor 0 1 2 3 4.4 5.9 10 25 40 40 80 80
Very poor 0 0 1 1 5.9 25 200 200 80 81 500 500
  NH4+ TP FC
a b c d a b c d a b c d
Excellent 0 0 0.1 0.5 0 0 0.03 0.1 0 0 20 200
Good 0.1 0.5 1 - 0.03 0.05 0.1 0.3 20 200 1000 2000
Average 0.5 1 2 2 0.05 0.1 0.3 0.5 1000 2000 20000 -
Poor 2 2 5 8 0.1 0.2 0.5 3 2000 3500 20000 50000
Very poor 5 8 50 250 0.2 3 20 20 3500 50000 1800000 1800000