Give a short note on reserves.

Reserves are the subset of the stock, which can be put into use with the help of existing technical ‘know-how' but their use has not been started. These can be used for meeting future requirements. River water can be used for generating hydroelectric power but presently, it is being utilized only to a limited extent. Thus, the water in the dams, forests etc. is a reserve which can be used in the future.