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. . DRAFT 10/5/95 COLORADO WATER CONSERVATION BOARD RECOVERY INSTREAM FLOW APPROPRIATION OPTIONS Option II . 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, 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 minus a development allowance 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 Monlhs: Non Runoff Months: Base Flow: 10% Exceedance flow minus the monthly development allowance. 20 % Exceedance flow minus the monthly development allowance. 80% Exceedance flow A development allowance ranging from 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). Monthly instream flow call triggers are developed for each month; when the flow at the Maybell gage drops below the monthly instream flow call trigger, junior water right are called out to meet the instream flow appropriation. The Carve Out, distributed on a monthly basis, is remains available for use by both senior conditional rights and water rights junior to the instream appropriation and is not included in the appropriation. The Carve Out, consisting of 52,000 af is distributed on the following basis: Month Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep cfs 63 39 40 42 48 50 115 95 98 III 90 69 Option II - I