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<br />Abstract <br /> <br />In 1973, the Colorado State Legislature <br />vested the Colorado Water Conservation Board <br />with the authority to appropriate instream flow <br />water rights in the State of Colorado. Today, <br />the Board holds 1,326 instream flow water <br />rights covering approximately 7,982 miles of <br />Colorado streams. Standardized field and <br />office procedures help to ensure that instream <br />flow recommendations reflect the amount of <br />water required to "preserve the natural <br />environment to a reasonable degree", as <br />prescribed by state statute. R2CROSS is one of <br />the standard techniques employed by state and <br /> <br />federal agencies to model instream hydraulic <br />parameters. R2CROSS was chosen because it <br />is time and labor efficient and produces <br />comparable results to more costly techniques, <br />Le., the Instream Flow Incremental <br />Methodology. This manuscript provides an <br />overview of Colorado's Instream Flow Program <br />and documentation for the Board's R2CROSS <br />Lotus macro. The R2CROSS macro runs <br />efficiently on an IBM-compatible 80486 <br />personal computer equipped with a hard disk <br />drive, and DOS 6.0, Windows 3.1, and Lotus <br />1-2-3 Release 4 for Windows software. <br /> <br />-11- <br />