Because in today`s date people want to use water from purifier and tap. so they don`t know the importance fresh water in river. but in village u see the importance of these kind of rivers. 
        the steps to take to control this kind of thing is to promote river water in big cities the tanker use to provide water should take water from river.
      if u like and if u want then mark as brainliest 
We should protect rivers by
 making legal laws which is equal to everyone
eradicate the pollution of water by releasing of toxic chemicals

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