I will not go in data ...

I will not go in data collection and examples. I will just like to tell my own experience in this regard. About one hundred year back, there was no human intervention in unrestricted flow of water in drainage channels like rivers and their tributaries. With development works like railways, roads, building construction, and other construction work, human interference in natural flow of water in natural drainage channels was badly influenced.  Mining work and mines particularly deep mines have very badly affected the natural flow of water in rivers.  The ever increasing population and greed of rich and influential persons in society always wanted to have their houses by the side of a lake or sea shore, more particularly within a lake at its centre.  As the population of the world has ever increasing trend, the submergence area of the dams is being used for construction of buildings both for commercial and residential purposes, forcing the government either abandon the dam or not to fill it upto FTL. In India thousands of village dams have disappeared since independence, as per record. To save the unrestrited flow of water in natural rivers and their tributaries, I have written a paper titled       " Catchment Areas and Their preservation" available on google drive freely with this link -  https://drive.google.com/file/d/1w-gsKoiKhe0Utctpyi1Ie2fs8W2DAkxC/view?usp=sharing   . If you find any difficulty in downloading the paper, you can write to me at yagrawal@bsnl.in .