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Capacity: <br />At least 347.0 cfs. (347.0 cfs was the maxi mum daily diversion recorded on June 20, <br />1947.) <br />Diversion Measurement Device: <br />Confluence of North Feeder D itch and South Feeder Ditch <br />DWR WDID: 5104601 <br />USGS ID: 09010000 - Grand River Ditch at La Poudre Pass <br />Datum: 10,175 feet above sea level NGVD29 <br />Ditch Outlet: 10 foot concrete Parshall flume e quipped with Stevens recorder and <br />satellite linked monitoring system (Parshal l flume, measurement recording device, and <br />associated concrete weir housed inside a 6 f oot by 6 foot timber shelter to protect system <br />from inclement weather and vandalism) <br />Conveyance Efficiency: <br />It is possible that a loss study was performed in coordination with the <br />decree for newly developed waters (W-9322- 78); however, such a study has not been <br />located at this time. Deliv ery of Grand River Ditch water down the Cache la Poudre <br />River to the Larimer County Canal is asse ssed a 5 percent tran sit loss by the Water <br />Commissioner. <br />HydroBase Data: <br />Diversions are reported as continuously monitored st reamflow records and as <br />administrative records by Colorado DWR. Daily and monthly continuously monitored <br />streamflow records for Station 09010000 ar e available from 1929 through 2002. Daily <br />and monthly administrative records for St ructure 5104601 are available for water years <br />1955 through 2002. Both continuously monitore d streamflow records and administrative <br />diversion records are ava ilable on a daily and monthl y basis through Colorado DWR <br />HydroBase. In addition, George Varra, Water Commissioner for Division 3, also keeps <br />monthly diversion records for Grand River Ditch in a spreadsheet with other transbasin <br />diversion records. <br />Available diversion data for Grand River D itch was reviewed and compared to identify <br />the best available data source (shown in Figur e 2). Monthly diversions for Grand River <br />Ditch are presented in Table 2. The preferred set of data id entified for Grand River Ditch <br />was the continuously monitored data for St ation 09010000. When compared to the other <br />available information sources, the data at Station 09010000 displayed the following <br />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 dive rsion data available, and <br />Continues to be operated as a re cording device through present. <br />GrandRiverDitch.doc 5 of 10 <br />