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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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