A water delivery system for a gas turbine compressor having a plurality of blade stages positioned about a rotating shaft is provided. The plurality of blade stages are configured to compress an airflow. The water delivery system includes a nozzle system to inject water between at least one pair of the plurality of blade stages; and a controller controlling whether the water injected by the nozzle system is injected at a first pressure that augments power output during an operation mode of the plurality of blade stages and a second, lower pressure that washes at least some of blades of the plurality of blade stages during a wash mode of the plurality of blade stages.