C150150 Feasibility Study - Laserfiche WebLink

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I I I I I I I I I I I I I I I I I I I Mainstem Municipal Wells. The City of Lamar has a well field in the Clay Creek basin a tributary of the Arkansas River. The City conveys water obtained from the Southeastern Colorado Water Conservancy District ("SECWCD") through the Fort Bent Canal to a recharge site on Clay Creek. Such deliveries are generally sufficient to replace the City's depletions. The Lamar Light & Power wells are used to cool the generation equipment at the Lamar Powerplant. Depletions are not charged against the Lamar Light and Power wells as the cooling system is fully contained and the heated water is discharged to the Lamar Canal and charged against the Lamar Canal decrees. The municipal wells used by the May V alley Water Association, Town of Wiley, Town of Granada, Town of Holly, Hasty Water Company, and McClave Water Association derive their supplies from the non- tributary Dakota and Cheyenne aquifers and are not subject to the Arkansas River Use Rules. The Granada School District, Lamar Community College, and Prowers County Courthouse are considered municipal members, but their wells are used strictly for irrigation purposes and their pump age is included with the irrigation pump age estimates. Mainstem Irrigation. The mainstem irrigation well pump age for LA WMA members is summarized in the table below for 1997 through 2002. MAINSTEM IRRIGATION WELL PUMPING Year Amount in Acre-Feet 1997 75,465 1998 46,998 1999 42,380 2000 65,398 2001 64,639 2002 63,734 The values for 1997 through 2002 were compiled by the Division Engineer from power and flow meter records. For this period, the irrigation pumpage in the mainstem averaged 59,769 acre-feet annually and ranged from 42,380 acre-feet in 1999 to 75,465 acre-feet in 1997. For planning purposes, mainstem pumpage should average about 59,703 acre-feet annually and should total about 44,777 acre-feet in a dry year. Stream Depletions. The depletions for each river segment described above were estimated using the accounting model and the above-described pumping levels. The depletions are reduced to allow for (1) wells operating as alternate points of diversion for senior surface water rights, (2) pre- compact wells, and (3) usability factors applied to depletions at the State line. The replacement requirements for an average year, such as 1950, totaled 18,312 acre-feet as shown on page 1, column 3 of Table 1 and were based on a series of average years of well pumping such that the depletions approached steady-state conditions. The replacement requirements for the second dry year following a series of average years, such as 2003, totaled 13,360 acre-feet as also shown on page 1, column 3 of Table 1. 3