Table 3
Indices classification and relative thresholds. HS (Hydrological Stability); IPS (Specific Polluosensitivity Index), TI (Trophic Index); ICMi (Intercalibration Common Metric Index). M1 = Mediterranean macrotypology; small streams, mean altitude; M4 = Mediterranean macrotypology; mean dimension streams, mountain; M5 = Mediterranean macrotypology; intermittent streams.
| Quality | HS | IPS | TI | ICMi | ||
|---|---|---|---|---|---|---|
| M1–M4 | M5 | |||||
| I class | High | 16–20 | 17–20 | 1–1.5 | 0.80–1 | 0.88–1 |
| II class | Good | 12–14 | 13–16.9 | 1.6–2.6 | 0.61–0.79 | 0.65–0.87 |
| III class | Moderate-bad | 4–10 | 0–12.9 | 2.7–4 | 0–0.60 | 0–0.64 |
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