An irrigation impact sprinkler including a base defining an axis (154), a pressurized water inlet mounted onto the base, a nozzle (190), communicating with the inlet, and providing a pressurized water stream (1100) which is generally outwardly directed relative to the axis and a water stream deflector for engaging the pressurized water stream and deflecting at least part of the water stream azimuthally with respect to the axis, the deflector including a first pressurized water stream engagement surface (320) and a second pressurized water stream engagement surface (322) downstream of the first engagement surface, the first engagement surface having a pressurized water stream directing configuration arranged to direct a first portion (1102) of the stream impinging thereon, which does not exceed a predetermined quantity, onto the second surface (322) and to direct at least a second portion (1104,1106) of the stream impinging thereon, which at least a second portion exceeds the predetermined quantity, not onto the second engagement surface (322).
