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<br />Current Version: 3 <br />Version Date: 8/4/92 <br />Previously Reviewed by: CMB, Committee' <br />Edited by: CRR <br /> <br /> <br />. ,,-, ' <br />DtJD!59 <br /> <br />USER SESSION DESCRIPTION NO.2 <br />"Study Upper Basin Impacts of Contract Fish Releases" <br /> <br />Hypothetical User <br /> <br />Staff Hydrologist for Upper Gunnison River Water Conservancy District (UGRWCD), <br />an expert-level user. <br /> <br />Assumed Context of Hypothetical Session <br /> <br />The "recovery program" has proposed a set of three minimum stre.mflow hydrogr.ph& <br />for the Gunnison River below the Redlands headgate to protect endangered fish species. The <br />three hydrographs represent minimum flow regimes to be maintained in wet, average, and dry <br />years, respectively. These minimum streamflow levels are to be met by contract releases from <br />Blue Mesa Reservoir, if necessary. <br /> <br />The UGRWCD Board is concerned that designating aponion of the release from Blue <br />Mesa as a contract delivery, which must be protected past the Redlands headgate, may reduce <br />the amount of "free water" available within the basin and trigger increased calls upon <br />upstream junior water rights. <br /> <br />The Staff Hydrologist's assignment is to quantify the Blue Mesa AUl!.mentatinn Pool <br />requirements needed to protect upstream users. <br /> <br />Model Capabilities and Limitations Illustrated by this Session <br /> <br />1. <br /> <br />This user session requires that the model be capable of representing <br />minimum streamflow regimes which are supported only by contract <br />releases from particular reservoirs. <br /> <br />;\:' <br />'. <br /> <br />2, The ease with which a user can specify and manipulate the parameters <br />of such contract-supported flow regimes will determine how usable this <br />theoretical capability is. <br /> <br />3. The 'session illustrates how the model can be used to quantify a result <br />indirectly (e.g. Augmentation Pool Requirements) by measuring <br />another direct model output (e.g. maximum annual shonages to a <br />group of demands). <br /> <br /> <br />Things to Think About <br /> <br />1. A complete definition of contract-supported flow regimes and their <br />interaction with other elements, e.g. reservoirs, of the basin model. <br /> <br />.~ <br /> <br />2. <br /> <br />How operational criteria such as "wet, average, and dry" years should <br />be interpreted in relation to historical or synthetic inflow data. <br /> <br />0: <br /> <br />;.. <br /> <br />~ ~ <br /> <br />J:..t <br /> <br />,J';- ~~1 <br />:,,:&,~,~i; :~ ,..i,;__~.litt~ <br />~"_,,. ,__,',;_.1.""",~-_~_J1..,~Jo-:",,<,,'d_~~JL' _.;= =,_ <br />