Water pours smoothly over river weir as pelicans sit on log above

weir water management outflow river water pelecanus erythrorhynchos overflow buoy fishing seabird environment shoreline flow turbulent falls log hunting ornithology dam drown drop turbulence rest dry erythrorhynchos pelican birdwatching pour concrete pelecanidae clear colony nature bird engineering rock wing outdoor hungry current countryside rural avian smooth orange hazard technology onocrotalus dangerous