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<br /> <br />fH11884 <br /> <br />different storage levels. The reservoir releases were computed throughout the <br />system to maintain all of the reservoirs within the same relative storage level <br />each month. A control point was defined as having a flow shortage for any month <br />that a diversion or reservoir release was reduced due to an operating rule, a <br />minimum-flow requirement, or an InsuffIcient quantity of water. Output from this <br />model includes monthly and annual summaries of streamflow, reservoir conditions, <br />and flow shortages. <br /> <br />The dissolved-sol ids model simulated monthly streamflow and both dissolved- <br />solids concentrations and loads at specific locations in a river basin. The Yampa <br />River basin Was depicted in the model by designating control points at reservoirs, <br />diversions, and streamflow-gaging stations. The flow-routing part of this model <br />operates similarly to the multireservoir-flow model but is much more restricted in <br />the size of the configuration that can be modeled.. Data used in the model also are <br />5 imi lar to those used in the multireservoi.r-flowmodel, except for the addition of <br />dissolved-sol ids information. Output from this model includes simulated monthly <br />and annual summaries of flow, dissolved-solids concentrations, and loads for each <br />control-point location. <br /> <br />The single-reservoir model (Adams, 1974) was developed to simulate hydrologic <br />conditions in deep reservoirs with horizontal isotherms in which temperature and <br />selected water-quality variables are functions of depth and time. Flow patterns <br />and the corresponding water quality within such reservoirs are affected not only <br />by the location and quantity of inflows and outflows but also by the temperature <br />gradients in a vertical column of water. Mathematically, this model is more com- <br />pI icated than the two models previously discussed. This model requires the simul- <br />taneous solution of the equations of state, motion, continuity, conservation of <br />heat, and conservation of mass. Each reservoir is depicted in the model by a Se- <br />ries of horizontal elements (fig. 2) which are identified by elevation, horizontal <br />area, and thickness. The inflow and its dissolved-sol ids concentrati.on must be <br />distrlbutedubased on the vertical-density profileuto each of the elements, and <br />the quantity and location of all releases must be identified.. Because water tem-. <br />perature is a driving force within the model, the temperature of the inflow also <br />must be est imated. Fi na 11 y, major factors that affect the water. temperature at <br />the reservoir surface must be entered Into the model. Such factors include solar <br />radiation, wind speed, relative humidity, and air temperature. Output from this <br />model includes water-temperature and specific.conductance profiles within a given <br />reservoir at selected time intervals and the water-temperature and dissolved- <br />solids characteristics of reservoir releases. <br /> <br />5 <br /> <br />5 <br />~ <br />,. <br />~ <br /> <br />.'" <br />'., <br /> <br />" <br /> <br />.': <br />.' <br /> <br />0;', <br /> <br />L' <br /> <br />':>. <br />,'. <br /> <br />: .~, <br />,.' <br />-;.; <br /> <br /> <br /> <br />l'_ <br />