How do dams affect the hydrological cycle? (please answer in 3-4lines a bit urgent...)?

Question

How do dams affect the hydrological cycle? (please answer in 3-4lines a bit urgent...)?

Answer 1

The damming of a river creates a reservoir upstream from the dam. The reservoir waters spill out into the surrounding environments, flooding the natural habitats that existed before the dam’s construction.  Permanent inundation caused by reservoir flooding also alters the wetlands, forests and other habitats surrounding the river.

A dam causes or alters the formation of riverbanks, deltas, alluvial fans, braided rivers, oxbow lakes, levees and coastal shores.  

Answer 2

The flow downstream is also affected as the flow is controlled and not a natural hydrological cycle as above also .