A human construction at the end of a river or lake, that aims to store water for later use , is described as dam.
advantage 1. act as a source which can be used at the time of crises.
2. construction of dam require labour , which provide employment.
disadvantage 1. leads to destruction of natural resources as it require huge amount of it.
2. decrease fertlity of soil as all the fertile soil is traped in the dam and get settled at the end.