Abstract: A machine in accordance with the invention includes a sprinkler gun (3) placed at the end of a hose (1) which is wound onto a drum (2) rotated by a flexible actuator (12) which actuates a rocker arm (13) carrying a finger (15) co-operating with regularly spaced-apart holes situated in a ring (31). The machine includes a computer (18). The machine also includes a sensor (30) for sensing angular displacement of the drum and situated in the proximity of the ring (31). The machine also includes a pressure sensor (40) at the water inlet to the machine. The computer is programmed to calculate the ideal speed of displacement of the sprinkler gun (3) as a function of the depth of water to be delivered and of the water flow rate which it calculates on the basis of the pressure of which is measured, with the computer also being programmed to calculate the ideal duration of an actuator cycle.