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Diversion Measurement Device: <br />DWR WDID: 0304600 <br />USGS ID: 06747000 -Laramie Poudre Tunnel near Chambers Lake <br />Datum: 8,565 feet above sea level NGVD29 <br />Ditch Outlet: 10 foot Parshall flume equipped with Stevens recorder and satellite linked <br />monitoring system. <br />Conveyance Efficiency: The Tunnel is mostly rock lined. <br />HydroBase Data: Diversions are reported as continuously monitored streamflow records and as <br />administrative records. Continuously monitored streamflow records are available for <br />water year 1929 through 2002 for Station 06747000. Administrative records are <br />available for water year 1955 through 2002 for Structure 0304600. Both continuously <br />monitored streamflow records and administrative records are available on a daily and <br />monthly basis through Colorado DWR HydroBase. In addition, George Varra, Water <br />Commissioner for Division 3, also keeps monthly diversion records for the Laramie <br />Poudre Tunnel in a spreadsheet with other transbasin diversion records. <br />Available diversion data for Laramie Poudre Tunnel was reviewed and compared to <br />identify the best available data source (shown of Figure 2). The preferred set of data <br />identified for Laramie Poudre Tunnel was the continuously monitored streamflow gage <br />Station 06747000. When compared to the other available information sources, the <br />streamflow data at Station 06747000 displayed the following characteristics: <br />• The longest period of record, <br />• The most complete set of data prior to and throughout the period of study, <br />• Corresponding monthly and daily diversion data available, and <br />• Continues to be operated as a recording device through present. <br />LaramiePoudreTunnel.doc 5 of 10 <br />