Considerable money is spent to build dams to retain the water. Also, continuous control and management of the water resources is exercised both in the case in which the water is used for abstraction, purification and distribution, or for other uses such as hydroelectric power generation. It is argued that in line with the definition of cultivated assets in the SEEA and in the SNA, water in the reservoirs should be considered a produced asset. This would imply that, in parallel with the treatment of natural growth of cultivated forest and fish as produced asset, precipitation and inflows of water in the reservoirs should be considered as capital formation. Should water in the reservoir be added to the classification of produced assets?