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Table 3 Class boundaries of water quality for some indicators used in the IQBP (Hébert[1997])

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

Class FC BOD5 TP O2 SS NOx- NH4+
(cfu/100 ml) (mg/L) (mg/L) (%) (mg/L) (mg/L) (mg/L)
A ≤ 200 ≤ 1,7 <=0.03 88 – 124 ≤ 6 ≤ 0,50 ≤ 0,23
B 201 – 1000 1,8 – 3,0 0,031 – 0,050 0.03 – 0.05 7 – 13 0,51 – 1,00 0,24 – 0,50
125 – 130
C 1001 – 2000 3,1 – 4,3 0,051 – 0,100 70 – 79 14 – 24 1,01 – 2,00 0,51 – 0,90
131 – 140
D 2001 – 3500 4,4 – 5,9 0,101 – 0,200 55 – 69 25 – 41 2,01 – 5,00 0,91 – 1,50
141 – 150
E >3500 > 5,9 > 0,200 < 55 > 41 > 5,00 > 1,50
> 150