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<br />0016l? <br /> <br />Colorado River Simulation <br />Model <br /> <br />The model simulates river basin flows on a mon- <br />thly time frame starting at the top of the basin <br />and proceeding completely through the basin to <br />the bottom. Simulation is done reach by reach <br />in an order specified by the basin configuration <br />as input to the model. Within a reach, computa- <br />tions are made from upstream to downstream <br />end. <br /> <br />The general operation of the simulation model is <br />shown schematically on figure 4. <br /> <br />Riverflows are calculated at each inflow, de- <br />mand, and reservoir sequence point. All calcula- <br />tions for riverflow are based on the continuity <br />equation: <br /> <br />, <br />" <br />! <br /> <br />Flow at next sequence point = Flow from <br />preceding sequence point + Inflow - Demand <br /> <br />When there is not enough flow in the river at a <br />sequence point to supply a demand, a search is <br />made of upstream reservoirs for the additional <br />water needed. If there are reservoirs upstream <br />with sufficient water in storage, the additional <br />increment needed is released and passed through <br />the system to the point needed. If adequate <br />water is found, the demand is met and the calcu- <br />lations proceed to the next downstream se- <br />quence point. However, if the demand cannot <br />be satisfied, the amount of shortage is com- <br />puted, the available water is diverted, and a <br />shortage message is printed and calculations <br />proceed. <br /> <br />A reservoir is generally operated to meet a target <br />end-of-month contents. A release is determined <br /> <br />7 <br />