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1) Prewitt Inlet Canal (Structure ID 0100829) <br />The Prewitt Inlet Canal diverts water from the South Platte River for storage in Prewitt <br />Reservoir. The headgate of the inlet canal is located on the south side of the river in Water <br />District land travels in an east-northeasterly direction to the reservoir. The inlet canal is unlined <br />for the extent of its length and is in good condition. The inlet canal shares a diversion structure <br />in the river with the Tetsel Ditch, which carries water to lands on the north side of the river. <br />Managers of the Prewitt system help manage deliveries to the Tetsel Ditch. <br />The inlet canal is also used to carry water for delivery to the Johnson and Edwards Ditch. These <br />deliveries are made at the Johnson and Edwards Ditch headgate, located approximately two <br />miles below the headgate of the inlet canal on the river. The Prewitt Inlet Canal does not directly <br />deliver water for irrigation. All water diverted through the inlet canal is carried either directly to <br />Prewitt Reservoir for storage or delivered to the Johnson and Edwards Ditch. <br />Length: Approximately 6 miles. <br />Capacity: The capacity of the inlet canal is 695 cfs and has not changed over time. The capacity <br />of the inlet canal is equal to the decreed rate of diversion. <br />Measurement Device: Measurements of diversions through the inlet canal are made at a double <br />V-notch weir located approximately one mile above the reservoir, just below U. S. <br />Highway 6. These measurements reflect water that is conveyed into the reservoir. <br />Deliveries to the Johnson and Edwards Ditch occur approximately two miles above the <br />measuring device on the inlet canal, and these deliveries are measured and recorded <br />separately. <br />Conveyance Efficiency: Seepage losses from the inlet canal are small because of its short <br />length. The measuring device on the inlet canal is located immediately above the <br />reservoir, and therefore diversion records reflect reservoir inflows after seepage losses. <br />Return Flow Locations: Return flows from seepage along the inlet canal recharges ground <br />water in the Johnson and Edward Ditch service area, and/or accrue to the South Platte <br />River above the South Platte Ditch. Return flows reportedly occur primarily during the <br />winter and spring months when the reservoir is filling. <br />HydroBase Data: Historic records of diversion into storage at Prewitt Reservoir are recorded in <br />HydroBase under the Prewitt Inlet Canal structure and the Prewitt Reservoir structure. <br />The diversion records for both structures need to be combined resulting in a more <br />complete diversion record. Total historical diversions through the inlet canal into Prewitt <br />Reservoir average approximately 30,000 acre-feet per year. The Prewitt Manager is <br />responsible for collecting diversion records at the measuring device located on the inlet <br />canal. Records are then reported to the Water Commissioner in Water District 64. The <br />Manager provided paper diversion records from 1926 through 1986. More recent <br />diversion records for the inlet canal are available in Hydrobase. <br />Prewitt Reservoir.doc Page 8 of 15 <br />