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<br />". <br /> <br />tJ02906 <br /> <br />. <br /> <br />" <br /> <br />- <br /> <br />Colondo River Simulation" <br />Model <br /> <br />The"model olmnlat_ river basin flows on a mon- <br />thly time"frame staniDg at the top of the basin <br />and prcK.....ii'1gcompletely through the basin to <br />the bottom. S"mmlmon is done reach by reach <br />in an order specified by the basin configur.ltion <br />as input to the model. W"rthina reach. computa- <br />tions are made from upstream to downstream <br />end. <br /> <br />The gencra1operation of the simulation model is <br />shown scl1....."ri...."y on ligure 4. <br /> <br />Rivertlows 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 />p.... _Ii... sequence point + Intlow - Demand <br /> <br />When there is not enough flow in the river at a <br />sequence point to supply a n.......nd. a search is <br />made of upstream reservoirs for the additional <br />Wlttc:r needed. If there are reservoirs upstream <br />with sufficient Wlttc:r in storage. the additional <br />incrcmcn1 needed is released and passed through <br />thesystcm 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 m~'"ge is printed and calcuJations <br />proceed. <br /> <br />A reservoir is generally operated to meet a target <br />end-of-month contents. A release is determined <br /> <br />1 <br />