Table 2 Estimated habitat alteration due to impounding from dams, weirs, and sluices
From: Over 200,000 kilometers of free-flowing river habitat in Europe is altered due to impoundments
Barrier type | Number of barriers with height info* | Calculated impoundment length (km) | Calculated remaining habitat** (km) | Calculated habitat alteration (km) | Proportion of barriers with height info (%) | Underreporting error (%) | Est. impoundment length (km) | Est. remaining habitat length (km) | Est. habitat alteration (km) |
|---|---|---|---|---|---|---|---|---|---|
Dam | 28,913 | 22,180 | 8591 | 13,588 | 48.3% | 15.7% | 54,473 | 21,100 | 33,373 |
Weir | 59,099 | 38,195 | 18,000 | 20,196 | 32.0% | 58.2% | 285,552 | 134,566 | 150,986 |
Sluice | 4155 | 6686 | 3553 | 3132 | 59.5% | 72.0% | 40,129 | 21,328 | 18,801 |
Total | 92,167 | 67,061 | 30,144 | 36,917 | - | - | 380,154 | 176,994 | 203,160 |
