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Govinda
You can Chanel it around a town so there is no flooding

If some place needs water then you can divert the water to the specific place

Also stopping it and creating a dam can offer the positive results of inexpensive energy, increased recreation opportunity and flood control

Hope this helps

Answer:

Three positive effects are -

a) Water diverted into canals for agriculture

b) For generating electricity

c) for preventing floods.

Explanation:

Water within a water body is retained, diverted or stopped basically for three main reasons -

a) The water from main water body is diverted towards canal or regions that are devoid of water to serve the people and fulfill the requirement of agriculture.

b) The water is stored in elevated reservoir so that electricity can be produced from it.

c) Water is some time stopped through barrages or dams to prevent floods.

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