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The Surface Waters (River Ecosystem) (Classification) Regulations 1994
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Regulation 2(2)
SCHEDULERIVER ECOSYSTEM CLASSIFICATIONS
| (1) Class | (2) Dissolved Oxygen % saturation 10 percentile | (3) BOD(ATU) mg/l 90 percentile | (4) Total Ammonia mg N/l 90 percentile | (5) Un-ionised Ammonia mg N/l 95 percentile | (6) pH lower limit as 5 percentile; upper limit as 95 percentile | (7) Hardness mg/l CaCO3 | (8) Dissolved Copper μg/l 95 percentile | (9) Total Zinc μg/l 95 percentile |
|---|---|---|---|---|---|---|---|---|
| RE1 | 80 | 2.5 | 0.25 | 0.021 | 6.0-9.0 | ≤ 10 > 10 and ≤ 50 > 50 and ≤ 100 > 100 | 5 22 40 112 | 30 200 300 500 |
| RE2 | 70 | 4.0 | 0.6 | 0.021 | 6.0-9.0 | ≤ 10 > 10 and ≤ 50 > 50 and ≤ 100 > 100 | 5 22 40 112 | 30 200 300 500 |
| RE3 | 60 | 6.0 | 1.3 | 0.021 | 6.0-9.0 ≤ 10 > 10 and ≤ 50 > 50 and ≤ 100 > 100 | 5 22 40 112 | 300 700 1000 2000 | |
| RE4 | 50 | 8.0 | 2.5 | — | 6.0-9.0 | ≤ 10 > 10 and ≤ 50 > 50 and ≤ 100 > 100 | 5 22 40 112 | 300 700 1000 2000 |
| RE5 | 20 | 15.0 | 9.0 | — | — | — | — | — |
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