1) Animal mothers 2) Anti-flood structures 3) Aswan and Hoover 4) Aswan and kariba 5) Aswan et al 6) Barriers 7) Bear Creek, Bull Shoals, etc 8) Beaver blocks 9) Beaver business 10) Beaver constructions 11) Beaver creations 12) Beaver products 13) Beaver projects 14) Beaver structures 15) Beaver-built barriers 1) Mares 2) Shes 3) Weirs 
earth or other construction along a river to control water flow