Research and analysis
B6i: Naturalness scores of large river and headwater stream ecosystems in England, 2022
Updated 1 December 2025
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| Naturalness component | habitat_type | variable | value |
|---|---|---|---|
| Biological | Large rivers | Class 1 | 51.60409556 |
| Biological | Large rivers | Class 2 | 0.4948805 |
| Biological | Large rivers | Class 3 | 8.4982935 |
| Biological | Large rivers | Class 4 | 6.12627986 |
| Biological | Large rivers | Class 5 | 33.2764505 |
| Chemical | Large rivers | Class 1 | 61.063698075714285 |
| Chemical | Large rivers | Class 2 | 14.701739657142856 |
| Chemical | Large rivers | Class 3 | 15.290035357142855 |
| Chemical | Large rivers | Class 4 | 7.433617577142857 |
| Chemical | Large rivers | Class 5 | 1.5109093285714283 |
| Cross-cutting | Large rivers | Class 1 | Not set |
| Cross-cutting | Large rivers | Class 2 | Not set |
| Cross-cutting | Large rivers | Class 3 | Not set |
| Cross-cutting | Large rivers | Class 4 | Not set |
| Cross-cutting | Large rivers | Class 5 | Not set |
| Hydrological | Large rivers | Class 1 | 46.57019706 |
| Hydrological | Large rivers | Class 2 | 9.395237566666667 |
| Hydrological | Large rivers | Class 3 | 13.667142783333333 |
| Hydrological | Large rivers | Class 4 | 9.570891866666669 |
| Hydrological | Large rivers | Class 5 | 20.79653073333333 |
| Physical | Large rivers | Class 1 | 20.620141855 |
| Physical | Large rivers | Class 2 | 14.23567759 |
| Physical | Large rivers | Class 3 | 18.30869999 |
| Physical | Large rivers | Class 4 | 26.782983837 |
| Physical | Large rivers | Class 5 | 20.05249673 |
| Biological | Headwater streams | Class 1 | 64.2688679 |
| Biological | Headwater streams | Class 2 | 0.5503145 |
| Biological | Headwater streams | Class 3 | 9.90566 |
| Biological | Headwater streams | Class 4 | 6.800314 |
| Biological | Headwater streams | Class 5 | 18.4748428 |
| Chemical | Headwater streams | Class 1 | 34.96219064 |
| Chemical | Headwater streams | Class 2 | 19.72176978 |
| Chemical | Headwater streams | Class 3 | 21.1116024 |
| Chemical | Headwater streams | Class 4 | 16.301055400000003 |
| Chemical | Headwater streams | Class 5 | 7.903381859999999 |
| Cross-cutting | Headwater streams | Class 1 | 3.7650367 |
| Cross-cutting | Headwater streams | Class 2 | 9.8265896 |
| Cross-cutting | Headwater streams | Class 3 | 21.684112 |
| Cross-cutting | Headwater streams | Class 4 | 38.478363 |
| Cross-cutting | Headwater streams | Class 5 | 26.2458991 |
| Hydrological | Headwater streams | Class 1 | 35.2697298 |
| Hydrological | Headwater streams | Class 2 | 12.8857092 |
| Hydrological | Headwater streams | Class 3 | 14.8860645 |
| Hydrological | Headwater streams | Class 4 | 17.485514000000002 |
| Hydrological | Headwater streams | Class 5 | 19.4729826 |
| Physical | Headwater streams | Class 1 | 21.25434506 |
| Physical | Headwater streams | Class 2 | 16.07471671 |
| Physical | Headwater streams | Class 3 | 18.1185838 |
| Physical | Headwater streams | Class 4 | 24.1870536 |
| Physical | Headwater streams | Class 5 | 20.365300580000003 |