Irrigation installation using hydraulic pressure using water available in valleys and mountains, said installation comprising a primary hydraulic system (20) having reservoir means (21) for catching water at high altitude, and penstock means (22) for transporting this captured water hundreds of meters below under very high pressure; said installation being characterized in that: - said primary system (20) comprises a hydraulic cylinder (33) for exploiting this very high pressure of the water in the primary hydraulic circuit, the hydraulic cylinder (33) being capable of using water of the primary hydraulic circuit, and in that it also comprises a secondary system (56) comprising, - a secondary system (56) comprising: • a secondary reserve (42) of a fluid, • the action of the hydraulic cylinder ( 33) being able to recover the fluid from the reserve (21), and to pump this fluid at the very top of the pipe (58) to the secondary reserve (42).
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