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. Calling Water Rights An analysis of Arkansas River calls found that surface water rights call approximately 97 percent of the time during a year. The Fort Lyon Canal, Rocky Ford Ditch, and Catlin Canal are generally the calling rights during the irrigation season. During the winter storage season (Nov. 15 _ Mar. 15), the winter storage decree (March 1, 1910) is the call. Because of the seniority of the calling water rights and the junior priorities associated with most CWPDA wells, the wells' stream depletions are generally always out of priority. . Adobe Creek Wells (User Group 309) These wells are located near Haswell and Karval. The findings of a 1997 Wheeler engineering report generally found that these wells do not impact the Arkansas River. It is recommended that CWPDA encourage the well owners to seek a decree requesting nontributGry status for these wells. Pumping Estimates This study investigated the measured and estimated pumping of CWPDA 1 999 member wells. In Section III.A of this report, the pumping by Rule 3 wells was analyzed under two . scenarios. It is concluded that the 75 percent scenario, which provided the lowest estimate of the two pumping scenarios, is probably the best estimate for future pumping by CWPDA Rule 3 member wells. Annually, CWPDA's Rule 3 wells will pump 21,454 to 72,745 acre-feet and average 41,829 acre-feet. In Section III.B, the pumping by Rule 4 and 5 wells was analyzed. This group of wells is comprised of municipal wells and non-municipal (Le. non..Rule 3 irrigation, commercial, industrial, feedlot supply) wells. Estimated pumping for the municipal wells is estimated to be 6,900 acre-feet and will slowly increase to 9,240 acre-feet by the year 2023. Estimated annual pumping for non- municipal Rule 4 and 5 wells will range from 5,330 to 7,560 acre-feet .and average 6,110 acre-feet. Average and maximum annual pumping for all member weUs at essential water rights administration locations is shown in Table 1-1. CWPDA: Sec I 10/19/99 Page 2 Stream Depletions Total annual stream depletions by CWPDA's Rul'e 3, 4, and 5 non-municipal wells are estimated to average 17,615 acre-feet and peak at about 23,700 acre-feet during a drought. It is important to note the difference of about 6,000 acre-feet between average annual depletions and drought period depletions. . Municipal well depletions will range from 2,177 to :3,583 acre-feet. Depletions upstream of Fort Lyon Canal are estimated to range from 754 to 1,413 acre-feet. The remaining depletions,