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, . . DRAFf 10/5/95 COLORADO WATER CONSERVATION BOARD RECOVERY INSTREAM FLOW APPROPRIATION OPTIONS Option I . Yampa River Instream Flow Appropriation The following is one of several options which have been developed through extensive consultations over the last year among representatives of the Colorado Water Conservation Board (CWCB), State Engineer and Division Engineers, Attorney General, Colorado River Water Conservation District, Colorado Water Congress, U.S. Fish and Wildlife Service (FWS), and many other water interests for consideration by the CWCB in late 1995 as a part of its efforts to appropriate endangered fish recovery instream flows in the Yampa River. Concept An instream flow right based on the FWS flow recommendation is appropriated. A Base Flow component is included in the instream flow right during the non runoff months at the 80% exceedance level. The following table lists the appropriation amounts: Runoff Months: Non Runoff Months: Base Flow: 10% Exceedance flow 20% Exceedance flow 80% Exceedance flow NON RUNOFF RUNOFF NON RUNOFF Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep 10% Exc. 5564 10151 9080 3230 20% Exc. 335 336 320 299 335 694 520 242 80% Exc. 88 172 157 187 221 305 125 45 A development allowance ranging from approximately 52,000 af to 225,000 af is provided to allow development of Colorado's unused compact apportionment. The development allowance consists of a Carve Out and a Modifiable Portion (Paragraph 4). The Carve Out, distributed on a monthly basis, is excluded from the appropriation so that it remains available for use by both senior conditional rights and water rights junior to the instream flow appropriation. The Carve Out, consisting of 52,000 af, is distributed on the following basis: Carveout (cfs) Mouth Oct cfs 63 Nov 39 Dec 40 Jau 42 Feb 48 Mar Apr 50 115 May Juu 95 98 Jul 111 Aug Sep 90 69 Option I - I