Abstract: A computer-based controller controls and displays, on a real-time basis, the operation of a large number of watering stations. The controller provides functional statistics, assessment of the system flow characteristics and monitoring of station and system malfunctions. Control and modification of each station is turn-on time during each watering, the time between each station's watering and the accumulated watering time interval are also provided. Soil moisture sensors and a flow meter provide reliable irrigation of large lawns while optimizing water conservation. Prompt response to malfunctions at the system and station level prevents costly catastrophes plaguing prior art irrigation control systems. A scanning irrigation controller permits multiple applications of small amounts of water during the irrigation cycle, resulting in reduced runoff loss and reduced leaching and puddling from oversaturation.