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. who are now operating under an annual Substitute Water Supply Plan. A major source of augmentation release in the Case is Ruedi Reservoir, located on the Fryingpan River. Releases from the Reservoir enter the Roaring Fork River at its confluence with the Fryingpan. Of the 120 water users, 20 are located within the "upper" Roaring Fork River above its confluence with the Fryingpan River. These users will be augmented by exchange as the Reservoir releases do not directly enter this reach of river. The application referred to as the "Batch Plan" is a requirement of the BWCO's approved Operating Plan. Under the operation of the plan, the State Engineer requires the BWCO periodically move its contractees from the Substitute Water Supply Plan to a decreed plan for augmentation and exchange. Case No. 01 CW305 is one in a series of plans for augmentation that have been decreed as required. 1.2 Case No. 02CW77 Case No. 02CW77 outlines a plan for augmentation and exchange for water uses that . will join the BWCO's Operating Plan on or after January 1, 2005. The application, referred to as the "Umbrella Plan," seeks to establish specific exchange reaches and limited exchange amounts at locations throughout the BWCO service area including the Roaring Fork River above its confluence with the Fryingpan River. Within the "upper" Roaring Fork reach, the BWCO requests an exchange of up to 2.25 cfs of depletion with a priority date of July 2, 2001. 1.3 CWCB Water Right Ouring the 1970s and 1980s, the CWCB established minimum instream flows for numerous reaches on the Roaring Fork River. In 1985 (Case No. 85CW646), an instream flow decree for the portion of the Roaring Fork River between Maroon Creek and the Fryingpan River was established. The instream flow was decreed for 55 cfs between April 1 and September 30, and 30 cfs between October 1 and March 31. . 4