The University of Minnesota has some really great resources for information about irrigating smarter. Take some time to browse their website and read the materials linked on this page to learn how to save money and water.
The U’s Turfgrass Science page: http://turf.umn.edu/
Learn how to do a self audit for irrigation: UMN Extension Auditing Irrigation Systems
Water saving strategies for your lawn: UMN Extension Lawn Water Saving Strategies