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<br />Basic Concepts <br /> <br />". {. J"I ::- ;.~ t, <br />..f..i... 'ill <br />Control ReservOIrs , <br /> <br />3.9 Control Reservoirs <br />Project demands may call for release of stored water from specific reservoics, called control <br />reservoics. <br />Diversion and IFR demands call upon the control resecvoics specified by CRS cards in the <br />Netwock File (see Appendix B.5 [page 41]); power requicements automatically call upon the reservoir <br />at the power plant station. <br />If no control reservoic is specified for a diversion or IFR, that demand may not draw on <br />stored water. <br />When a demand requires stored water and several control reservoirs are given, the demand: <br />(1) Requests from each control reservoir, in the order given on the CRS card, the release <br />of all water above max content; then <br />(2) Requests from each control reservoir, in the same order, the release of all water <br />above target content; then <br />(3) Requests from each control reservoir, in the same order, the release of all water <br />above min content. <br />The process stops either when the demand is satisfied or when all the control reservoirs are <br />down to minimum content. <br />This feature is intended to give you some control over where the water comes from. If, for <br />instance, you are using off stream storage, then you don't want to draw on the offstream (pumped) <br />water when the demand could be satisfied by simply releasing water from an onstream reservoir. For <br />reservoirs in series, one above the other, you will want to list the control reservoirs from downstream <br />to upstream; this tends to deplete the downstream reservoirs first, but the pool maintenance routine <br />will restore the balance. For reservoirs in parallel, on different tributaries, you choose the order in <br />which they will be approached for water. <br />The order of the control reservoirs, coupled with the setting of max, min and target levels, <br />will give you a lot of latitude in making the river system operate the way you want it to. <br /> <br />March 25, 1991 <br /> <br />HYDROSS 4.1 <br /> <br />Page 21 <br />