Usually the water evaporates from the large masses of water ( oceans , seas and lakes ) and through air currents or winds sent the heights of the atmosphere where it becomes condensation or sublimation formation of rain or snow formation and distributed across continents , in their depths .
The rain that falls during the summer is very important for the development of agricultural crops and yields significant achievement in agriculture , as well as all living life and other human activities . But because of the rain falls in liquid form and fast , it flows through the rivers being swollen and occasionally they even brought flooding and other damage to man and the environment . So precipitation as rain washed , escaped through riverbeds and few reserves of groundwater supply ( it depends on many geological and soil type of coverage ) . This form of precipitation , which translates to water resources can only kaptohet through the construction of water accumulations in the valleys of the rivers suitable , which because of the time when it evaporates and loses about a half back into the atmosphere .
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