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Recently revised BMWP scores for specific stream habitats have been designed.
The Habitat Specific Scores are based on the following substrate compositions Riffles: >= 70% boulders and pebbles Pool: >= 70% sand and silt Riffle/Pool: the remainder
This has resulted in a modified scoring system for the families present. The different scoring systems are shown below
Original Revised Riffle/ BMWP BMWP Riffles Pools Pools
Planariidae 5 4.2 4.5 4.1 3.7 Dendrocoelidae 5 3.1 2.3 4.1 3.1 Neritidae 6 7.5 6.7 8.1 9.3 Viviparidae 6 6.3 2.1 4.7 7.1 Valvatidae 3 2.8 2.5 2.5 3.2 Hydrobiidae 3 3.9 4.1 3.9 3.7 Lymnaeidae 3 3 3.2 3.1 2.8 Physidae 3 1.8 0.9 1.5 2.8 Planorbidae 3 2.9 2.6 2.9 3.1 Ancylidae 6 5.6 5.5 5.5 6.2 Unionidae 6 5.2 4.7 4.8 5.5 Sphaeriidae 3 3.6 3.7 3.7 3.4 Oligochaeta 1 3.5 3.9 3.2 2.5 Piscicolidae 4 5 4.5 5.4 5.2 Glossiphoniidae 3 3.1 3 3.3 2.9 Hirudididae 3 0 0.3 0.3 Erpobdellidae 3 2.8 2.8 2.8 2.6 Asellidae 3 2.1 1.5 2.4 2.7 Corophiidae 6 6.1 5.4 5.1 6.5 Gammaridae 6 4.5 4.7 4.3 4.3 Astacidae 8 9 8.8 9 11.2 Siphlonuridae 10 11 11 Baetidae 4 5.3 5.5 4.8 5.1 Heptageniidae 10 9.8 9.7 10.7 13 Leptophlebiidae 10 8.9 8.7 8.9 9.9 Ephemerellidae 10 7.7 7.6 8.1 9.3 Potamanthidae 10 7.6 7.6 Ephemeridae 10 9.3 9 9.2 11 Caenidae 7 7.1 7.2 7.3 6.4 Taeniopterygidae 10 10.8 10.7 12.1 Nemouridae 7 9.1 9.2 8.5 8.8 Leuctridae 10 9.9 9.8 10.4 11.2 Capniidae 10 10 10.1 Perlodidae 10 10.7 10.8 10.7 10.9 Perlidae 10 12.5 12.5 12.2 Chloroperlidae 10 12.4 12.5 12.1 Platycnemidae 6 5.1 3.6 5.4 5.7 Coenagriidae 6 3.5 2.6 3.3 3.8 Lestidae 8 5.4 5.4 Calopterygidae 8 6.4 6 6.1 7.6 Gomphidae 8 Cordulegasteridae 8 8.6 9.5 6.5 7.6 Aeshnidae 8 6.1 7 6.9 5.7 Corduliidae 8 Libellulidae 8 5 5 Mesoveliidae 5 4.7 4.9 4 5.1 Hydrometridae 5 5.3 5 6.2 4.9 Gerridae 5 4.7 4.5 5 4.7 Nepidae 5 4.3 4.1 4.2 4.5 Naucoridae 5 4.3 4.3 Aphelocheiridae 10 8.9 8.4 9.5 11.7 Notonectidae 5 3.8 1.8 3.4 4.4 Pleidae 5 3.9 3.9 Corixidae 5 3.7 3.6 3.5 3.9 Haliplidae 5 4 3.7 4.2 4.3 Hygrobiidae 5 2.6 5.6 -0.8 2.6 Dytiscidae 5 4.8 5.2 4.3 4.2 Gyrinidae 5 7.8 8.1 7.4 6.8 Hydrophilidae 5 5.1 5.5 4.5 3.9 Clambidae 5 Scirtidae 5 6.5 6.9 6.2 5.8 Dryopidae 5 6.5 6.5 Elmidae 5 6.4 6.5 6.1 6.5 Chrysomelidae 5 4.2 4.9 1.1 4.1 Curculionidae 5 4 4.7 3.1 2.9 Sialidae 4 4.5 4.7 4.7 4.3 Rhyacophilidae 7 8.3 8.2 8.6 9.6 Philopotamidae 8 10.6 10.7 9.8 Polycentropidae 7 8.6 8.6 8.4 8.7 Psychomyiidae 8 6.9 6.4 7.4 8 Hydropsychidae 5 6.6 6.6 6.5 7.2 Hydroptilidae 6 6.7 6.7 6.8 6.5 Phryganeidae 10 7 6.6 5.4 8 Limnephilidae 7 6.9 7.1 6.5 6.6 Molannidae 10 8.9 7.8 8.1 10 Beraeidae 10 9 8.3 7.8 10 Odontoceridae 10 10.9 10.8 11.4 11.7 Leptoceridae 10 7.8 7.8 7.7 8.1 Goeridae 10 9.9 9.8 9.6 12.4 Lepidostomatidae 10 10.4 10.3 10.7 11.6 Brachycentridae 10 9.4 9.3 9.7 11 Sericostomatidae 10 9.2 9.1 9.3 10.3 Tipulidae 5 5.5 5.6 5 5.1 Chironomidae 2 3.7 4.1 3.4 2.8 Simuliidae 5 5.8 5.9 5.1 5.5
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