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Changes In Water Use and Supplies Prior To <br />1990 ’ s <br />• Mid - 1960s to present: Homestake Project water <br />delivered to Aurora through Otero pump plant & pipeline <br />• Early - 1970s to present: increased use of Denver Water <br />Metro exchange <br />• Mid 1970s to present: Nontributary water supplies were <br />utilized to meet municipal water supply needs with <br />additional return flows <br />• Late 1970s to present: Center pivot systems are installed <br />to increase irrigation efficiencies <br />37 <br />