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<br />Supply Irrigating Ditch Co. <br />March 24-26, 2003. <br /> <br />Agenda Item 24e <br /> <br />, <br /> <br />The SUDDlv Irriaatlna Ditch ComDanv <br />The SIDC is a mutual ditch company and a non-profit corporation registered in the State of <br />Colorado. There are 160 shareholders and 400 shares of stock. The SIDC has the power to set <br />annual assessments to be paid by the shareholders, the power to cut off water deliveries to <br />shareholders that fail to pay their assessments, and the power to offer stock for sale to pay <br />back assessments. <br /> <br />\ <br /> <br />e <br /> <br />Water Rlahts <br />The water rights owned by the SIDC include a direct flow right in amount of 92.2 CFS from St. <br />Vrain Creek, and a 51% interest in the Beaver Park Reservoir. The Beaver Park interest <br />delivers approximately 800 acre-feet per year. Records of the State Engineer's Office (1997 - <br />1999) indicate that the average annual volume diverted by the Supply Ditch has been about <br />9,500 acre-feet. <br /> <br />Proiect DescrlDtion <br />During the study of Knoth Reservoir and Dam, the following alternatives were evaluated: <br /> <br />The no action alternative <br />1) Complete rehabilitation of the two dams to Gage Height 20 feet ($735,800) <br />2) Complete rehabilitation of the two dams to Gage Height 25 feet ($1,428,480) <br />3) Complete rehabilitation of the two dams to Gage Height 30 feet ($2,193,000) <br /> <br />Following is a summary of each alternative: <br /> <br />No Action Alternative. a <br />This alternative was rejected because the need is apparent for some storage within the system .. <br />to increase the usable yield and to allow for more efficient operation of the ditch <br /> <br />Alternative 1 . Rehabilitate the dam to Its current capacity (Gage Height 20 feet) <br />This alternative involves rehabilitation of the dam to :approximately its current height and size, <br />which will store approximately 220 acre.feet. The total project cost is $735,800. This alternative <br />would not allow storage of the full conditional decre~, and was rejected for that reason. <br /> <br />Alternative 2 - Raise Dam Crest To Gage Height 25 feet. <br />This alternative is similar to Alternative 1 in all respects except the crest of the dam will be <br />raised approximately five feet in elevation from gage height 20 feet to gage height 25 feet. This <br />increases the reservoir storage to approximately 360 acre-feet. The total project cost is <br />$1,428,480. This alternative would not allow storage of the full conditional decree, and was <br />rejected for that reason. <br /> <br />Alternative 3 - Raise Dam Crest To Gage Height: 30 feet. <br />This alternative is similar to Alternatives 1 and 2 in all respects except the crest of the dam will <br />be raised approximately ten feet in elevation from gage height 20 feet to gage height 30 feet. <br />This increases the reservoir storage to approximately 540 acre-feet. The total project cost is <br />$2,193,000. This alternative would allow storage of the full conditional decree, and is the <br />preferred alternative. <br /> <br />Selected Alternative 3 This alternative involves: <br /> <br />1. <br />2. <br /> <br />Reshaping the upstream face of both dams and placement of a compacted clay <br />liner over the upstream face to inhibit seepage. <br />Excavation of a cutoff trench tied into the clay liner indicated above. <br /> <br />2 <br /> <br />e <br />