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19 analysis may be especially instructive for those study scenarios which exhibit substantial draw downs of Blue Mesa in very dry years. In actual operation in such dry years, Blue Mesa releases to make the targets imposed by this study for January through April might be curtailed and the actual draw down would be less severe than that predicted by this study. The targets provided by the USBR also assume that some water is held on account at Blue Mesa for the Uncompahgre Valley Water User Association (UVWUA) under the Taylor Park exchange agreemerlt. Releases from Taylor Park under the exchange agreement generally tend to increase storage contents at Blue Mesa and to reduce the storage space at Blue Mesa available to the USBR. The USBR targets for Blue Mesa presumably are set with this additional storage in mind. The exchange also makes storage capacity at Taylor Park available to the USBR, and permits higher storage targets and correspondingly less storage space at Blue Mesa. The flows below Crystal are genet'ally unaffected by the operation of the exchange since the same amount of storage releases will be delivered to meet irrigation demands at the Tunnel regardless of whether the releases are charged against the Blue Mesa exchange account or directly against Taylor Park storage. However, to the extent that the Taylor Park releases under the exchange increase storage at Blue Mesa, such exchange releases may result in some additional Blue Mesa releases to make targets. Records of the exchange exist for the periods November 1974 through June 1979 and August 1980 through May 1981. Reportedly no records of the WBLA, Inc. 1909 Broadway, #3, Boulder, Colorado 80302