turbid water during the flood falls from large dams and

architecture barrier brown canoeing cascade cascading corridor dam dangerous ecology electric electricity energy fish flood floodgate flow flowing granite hydroelectric hydrologist hydropower infrastructure landscape migration narrow old outdoor overcoming overflow pass polygonal power rapids reproduction reservoir shortcut spilled spillway stone stones stream technology trout turbulent wall water waterfall weir weirs turbid falls large dams forms lot foam neutrality height differences plants fish boulders