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Rivers are used for transportation, irrigation, generating energy and performing work, such as turning waterwheels. Rivers are also vital sources of fresh water for both industrial and residential applications.
Weirs are used to keep water levels higher on one side and to help slow the flow to a lower level The advantages are they trap debris to make removal easy and prevent blockages at the lower levels They are also used to increase the oxygen content in the water and so help water quality and the oxygen availability for the aquatic creatures ..