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I I I I , I I I I, I I .1 I I I I I I t 01"",1 "\ I 'i V Water and Storage Needs Assessment SECWCD/Assessment Enterprise December 10,1998 Transmountain Diversion 1986-1995 A\'eral!e Deliverv(l) Water Anportioned to(2): (af/yr) 1,012 Pueblo 2,549 Pueblo Ewing Ditch Wurtz Ditch Homestake Tunnel 22,187 Aurora/Colorado Springs Husk-Ivanhoe Tunnel 4,808 Pueblol Aurora 40,349 Colorado SpringslPueblolOthers 129 Catlin Canal Company Twin Lakes Tunnel Larkspur Ditch 131,464 (] ) SOLlrCe" Upper Colorado River Commission 1995 Annual Report. (2) Arkansas River Basin Study Phase I Report (Boyle, 1988). A key transmountain diversion for the SECWCD service area is the Fry-Ark Project, which began diversion operations in 1972. Water is diverted from the mainstream of the Fryingpan River and its tributaries and delivered through the Charles H. Boustead Tunnel to the Lake Fork of Arkansas River. Imported water is stored in Turquoise Reservoir on the Lake Fork and in Twin Lakes via conveyance through the Mt Elbert Conduit Terminal storage for Fry-Ark water is provided at Pueblo Reservoir. Turquoise Reservoir also regulates transmountain diversions through the Busk-Ivanhoe Tunnel and the Homestake TunneL Twin Lakes Reservoir stores water imported through the Boustead Tunnel, as well as water imported through the Homestake TunneL During 1986-1995, an average of 48,715 af/yr was imported to the Arkansas Basin through the Boustead TunneL In 1995, a wet year, 90,460 afwas brought through the tunnel and stored in available reservoir space. In 1996, only 36,000 af was brought through the tunnel because of carry-over in East Slope storage from 1995. Details on operations of the Fry-Ark Project are provided in Section 7.0 of this report. 2.1.3 Operation of the Fryingpan-Arkansas Project Operation of the Fry-Ark Project was originally defined in the report authorizing the Project and has evolved over time. Currently, Project operations, which are implemented by the USBR, can be summarized as follows: 1. Adequate vacant space is created in Turquoise Lake and Twin Lakes by the end of April, in anticipation of the current year diversions of Project and non-Project water from the west slope. This is accomplished through the release of Project water from the upper two reservoirs and conveyance of such water down the 97.l1ll\FinaUITEXT-A WPD m GEl Consultants, Inc. 2-3