World Geography
The main objective of multi-purpose river projects are

power generation by constructing hydro power stations
extension of irrigation facilities by constructing dams to store surplus water during the rainy seas
All of these
flood controls and making rivers navigable

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World Geography
The period of daylight

is nearly constant near the equator
reaches a maximum of 24 hour in the polar zones in summer
All of these
varies with latitude and the season

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