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East Portal Datum: 9,205 feet above sea level NGVD29 <br />West Portal Datum: 9,091 feet above sea level NGVD29 <br />Tunnel Outlet: 15 foot Parshall flume equipped with an A-35 recorder and satellite <br />linked monitoring system. <br />Conveyance Efficiency: The Tunnel is concrete lined. <br />HydroBase Data: Diversions are reported as continuously monitored streamflow records and as <br />administrative records by Colorado DWR. Continuously monitored streamflow data for <br />Station 09022500 are available for daily and monthly diversions from prior to 1950 <br />through water year 2002. Administrative records for Structure 5104655 are available for <br />daily and monthly diversions from 1985 through water year 2002. Both continuously <br />monitored streamflow records and administrative diversion records are available through <br />Colorado DWR HydroBase. In addition, Denver Water maintains monthly Moffat Water <br />Tunnel diversion data from 1950 through 2002. <br />Available diversion data for Moffat Water Tunnel was reviewed and compared to identify <br />the best available data source (shown in Figure 2). The preferred set of data identified for <br />Moffat Water Tunnel was the continuously monitored data for Station 09022500. When <br />compared to the other available information sources, the data at Station 09022500 <br />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 />MoffatTunnel.doc 5 of 10 <br />