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1997, J. H. L'Abée-Lund, J. E. Brittain, “Weir construction as environmental mitigation in Norwegian hydropower schemes”, in Hydropower '97, pages 51–54:
The weir must not represent a physical barrier to fish migration, both locally and throughout the whole river system. If necessary, a fishway is included in the weir.
A walkway over the weir is likely to be useful for the removal of floating debris trapped by the weir, or for working staunches and sluices on it as the rate of flow changes.
For a spell we done pretty well. Then there came a reg'lar terror of a sou'wester same as you don't get one summer in a thousand, and blowed the shanty flat and ripped about half of the weir poles out of the sand.