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 |