Table 1 Simplified rating table for the IMBP water quality indicators (Official Bulletin N°. 5062 of 5 December 2002)
From: River water quality index for Morocco using a fuzzy inference system
Sub-index | DO | BOD5 | COD | NH4+ | TP | FC | Index |
|---|---|---|---|---|---|---|---|
(mg/L) | (mg/L) | (mg/L) | (mg/L) | (mg/L) | (cfu/100 ml)1 | ||
Excellent | >7 | <3 | <30 | <=0.1 | <=0.1 | <=20 | 80 – 100 |
Good | 7 – 5 | 3 – 5 | 30 – 35 | 0.1 – 0.5 | 0.1 – 0.3 | 20 – 2000 | 60 – 80 |
Average | 5 – 3 | 5 – 10 | 35 – 40 | 0.5 – 2 | 0.3 – 0.5 | 2000 – 20000 | 40 – 60 |
Poor | 3 – 1 | 10 – 25 | 40 – 80 | 2 – 8 | 0.5 – 3 | >20000 | 20 – 40 |
Very poor | <1 | >25 | >80 | >8 | >3 | - | 0 – 20 |