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By M.I. L'Vovich(auth.)

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If the water table remains stable during many years of use of the aquifer, then this indicates that the amount of water extracted does not exceed the replenishable supply. If the table of groundwater being used drops regu]arly year after year, then this is an indication that the amount of water being taken exceeds the replenishable supply. Yet even this criterion is not always reliable in the case of extensive artesian basins being exploited only in individusl areas. The reduction of the head or a drop in the table of grcu.

The principal error in the premises of those who participated in that discussion was their failure to recognize fully that transpiration is not a useless expenditure of water, since the water transpired contributes to the production of the plant mass--wood or farm crops, and is one of the highest forms of use of water resources. Is the benefit great from low transpiration of the forest if it results in low productivity of the tree stand? It is better, cf course, if the forest is highly productive, even though it contributes more water for transpiration.

This brief description is, of course, considerably simplified, since it does not reveal many phenomena and processes that are involved in the water cycleø But to elucidate all these phenomena in their entirety would require a book or, more accurately, many books (and quite a few of them have already been written). Over the last 100 to 110 years hydrology has taken shape as the science that takes the water cycle as its principal subject matter. It is not a simple matter to determine the origins of any science, and there will always be qualificationsø But I believe that the origin of present-day hydrology goes back to the studies of the water balance of the Seine River done by P.

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