Reservoir. It has a part of the biosphere that fills in as a long haul stockpiling zone for water or supplements. A repository ordinarily implies a broadened characteristic or counterfeit lake, stockpiling lake or impoundment made utilizing a dam or bolt to store water.A reservoir is a man made or natural lake or pond or pool that is used as a water supply. It is usually created using a dam or lock, for example in river valleys a dam is used. It can be created by manipulating the flow of water out of an existing body of water.