Weir Weir Crest Width (m) # of keystones Range of Keystone Sizes (m) % Fish Passability (Low Water Level) % Fish Passability (Intermediate Water Level) % Fish Passability (High Water Level)
1 1.9 5 0.2 – 0.8 100 100 100 for </= 4 species
2 3.1 8 0.4 – 1.1 0* 100 for </= 4 species 100 for </= 4 species
3 2.2 4 0.6 – 0.8 100 100 100 for </= 4 species
4 2.4 3 0.6 – 1.3 100 100 for </= 4 species 100
5 3.6 9 0.5 – 1.0 100 100 100
6 3.5 9 0.6 – 1.1 100 100 for </= 4 species 100
7 3.3 8 0.2 – 1.1 100 100 100
8 3.5 9 0.2 – 1.3 100 100 100
9 2.7 6 0.3 – 0.7 100 100 100 for </= 4 species
10 2.5 7 0.2 – 1.0 100 100 for </= 4 species 100