retained behind a low dam, no reservoirs
pro: little flooding, river flow is not disrupted
cons: smaller, unpredictable
largest reservoir
Grand coube dam (WA)
largest dam: three gorge dam (yangtze river, china)
habitat restoration
danger of failing structures ( consider cost of repair)
restore
might change flow direction
legacy sediment (mental contamination)
yangtza river china
2 kilometers long
the electric output of 18 large coal-burning or nuclear power plants
displaced 12 million people
dam is built over seismic fault and already has small crack
erosion, sedimentation, flooding
spawn of fish
get back downstream past the dam through nets, channels, and transport pipes