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Conveyance Efficiency: The Home Supply Ditch is considered a losing ditch but only <br />experiences about 8 percent to 10 percent shrink down the ditch between the river <br />headgate and Lone Tree Reservoir. The Home Supply Ditch has not historically benefited <br />from significant amounts of return flows from and runoff from up-gradient lands. <br />Return Flow Locations: Return flows from lands irrigated by the Company water supplies <br />typically accrue based on their location: <br />• Return flows from irrigated parcels located above Lone Tree Reservoir accrue to <br />South Side Ditch system. <br />• Return flows from irrigated parcels located north of the Home Supply Ditch below <br />Lone Tree Reservoir accrue to the Big Thompson River, and <br />• Return flows from irrigated parcels located south of the Home Supply Ditch below <br />Lone Tree Reservoir accrue to the Little Thompson River. <br />Irrigated Crops: Approximately 16,500 acres are irrigated under the Consolidated Home <br />Supply Ditch and Reservoir Company system, according to Company representatives. <br />For reference, 15,000 acres are listed in the HydroBase database under the Home Supply <br />Ditch. According to Company representatives, crops grown under the ditch vary from <br />year-to-year but typically include corn, alfalfa, small grains, and sugar beets. All lands <br />are flood-irrigated although sprinklers have been installed on about 2 percent of the <br />irrigated lands over the last 5 years. <br />HydroBase Data: The monthly data available in HydroBase over the 1950-2002 period of <br />record pertaining to the Home Supply Ditch include the following: <br />Total River Diversions <br />• Complete record over 1950-2002 (see Figure 2) <br />• Historic diversion average of approximately 31,500 ac-ft/yr <br />Diversion classes (DivClass) include: <br />• River diversions for irrigation average of approximately 11,600 ac-ft/yr <br />• River diversions for storage average of approximately 8,300 ac-ft/yr <br />• River diversions, by exchange, for Mariano Reservoir storage releases of <br />approximately 4,500 ac-ft/yr <br />• From transbasin supplies <br />- Approximately 8,500 ac-ft/yr, on average 1955-1973 <br />- Approximately 3,000 ac-ft/yr, on average 1974-2002 <br />Home Supply Ditch Operating Memorandum.doc 5 of 15 February 16, 2005 <br />