The invention relates to a mobile irrigation apparatus (10) comprising: a wheel-mounted frame assembly supporting at least one sprinkler operated by a main control valve and adapted for movement in a specified direction across a field to be irrigated； a hydrant docking station (76) resiliently suspended from a frame, said docking station incorporating a valve actuator adapted to open a valve in a water hydrant (28) located along the path； a first substantially horizontal guide wing (72,74) extending forwardly of and angling upwardly away from said docking station (76)； a second substantially horizontal guide wing (78,80) extending rearwardly of and angling upwardly away from said docking station (76)； and at least one vertical alignment power actuator arranged to move at least one side of said docking station (76) in a vertical direction relative to said docking station frame in response to a height guide sensor mounted on said first or second substantially horizontal guide wings (72,74,78,80).
