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The model represents the basin as a network of approximately 200 arcs and 113 nodes and solves this, netwark monthly in three steps. In -the fi~st solution step, water is allocated among diver. sians, storage, and streamflows largely on the basis of water rights priorities; reservoirs bypass inflows ta satisfy senior demands and senior demands are permitted to draw water from storage if such bypasses are insufficient. In the second solution step, reservoirs 'are forced to release water to meet future municipal and industrial demands up to the amounts of those demands or the contract limits of those releases. In the third step, reservoirs arc forced to makesimilar releases to mect future thermal. electric and, in some scenarios, coal.gasification demands. The reason for separating the model solution into steps is to more accurately repr~sent the contract accounting of reservoir releases. ~ ~'1 .:lfi ~, ~,';.;,', [' ;,~~ "", ~.c j~ ~;:) ~.< s 001135 Executive Summary " , ~~'., ~{; ~:\': Certain demands (e.g" municipal demands) are represented as being less than 100% consump- tive, Allocations of water to these demands generates return flows which are represented as inflows at some downstream point in the model. The temporal pattern of consumptive use and return Oow for such demands reflects the nature o.f the specific water use. For example, snowmaking demands are con- sidered 5% ,:=onsumptive and generate return flows which occur in May and June. ~ .; ~~: ~:;~: ~;'- ~iX ,~ t-' f\ fl~ ~i,{ '. V The model is configured to represent three demand levels and three modes of water delivery. The three demand levels correspond to current (1989), year 2015. and year 2040 demand projections. The 'three delivery modes are direct flow only (no reservoir releases for any purpose), direct flow plus subordination of the Juniper rights to future demands, and direct flow plus reservoir releases. The rea. son for structuring the model to accommodate these delivery modes is to allow evaluation of the two transfer mechanisms for the Juniper rights to instream flow. The model was calibrated (verified would be a better term) by turning off all reservoir opera. tions, historical demand adjustments, and future demands and insuring that it reproduced historical gage flow at the Steamboat Springs and Maybell gages, ~:':: , ~:"~ ;~" ~\. .\' ~". f:': :i;;:~ ~~~ ~ '; ~: " ,c, " ~ ~' ~ ;~~ ',,,';