A fluid delivery system for use in an irrigation system comprises a pressure regulator, a variable flow nozzle, and a sprinkler. The pressure regulator reduces the fluid pressure of the fluid to a normalized pressure. The variable flow nozzle includes a housing and first and second rollers. The housing defines an inlet, an interior chamber, and an outlet. The rollers are positioned side by side in the interior chamber of the housing and each define a recessed channel extending circumferentially around longitudinal axes of the rollers and gradually increasing in size. The channels cooperatively form an orifice between the rollers for fluid to pass therethrough. The variable flow nozzle increases or decreases the fluid flow rate of the fluid by rotating the rollers so that the orifice increases or decreases in size.
