Water enters the fountains of Peterhof naturally through a system of locks, canals, reservoirs and springs from the Ropsha heights, and the height of the jets can vary depending on their filling. Pumps were never used in Peterhof. Tourists from all over the world come to see this fountain near famous palaces. The water delivery uses one tube pipe descending from the nearest hill. After the water comes down again in the lake, it flows out through the drain pipe. So even this very high fountain is working without any motor and comes back tube. And many fountains in the world are built according to this method. For hundreds of years of the existence of fountains, it never occurred to anyone to build a second pipe to return the water up the hill. So obviously, it is a one-way method.