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<br />Advanced Concepts <br /> <br />... ,~~. '\ ' <br />Offstream Storag.e ' ;. . .. " <br />. .. <br /> <br />b <br /> <br />5 Advanced Concepts <br />This section introduces some of the more advanced concepts of HYDROSS V4.00 <br /> <br />5.1 Offstream Storage <br />5.1.1 Diversions and Offstream Storal!e: Diversions to offstream storage should have <br />a lower priority Qater water right date) than any downstream diversion to be served by the offstream <br />reservoir. <br /> <br />01 - Iror~ o........on <br /> <br />D <br /> <br /> <br />1tl~.._.___,..towIhI_M <br /> <br />Dt - eor.umptl... DI...,,1on <br /> <br />but it will not do both. <br /> <br />01 = Storage Diversion <br />02 = Consumptive Diversion <br /> <br />01 must have a lower priority than 02. <br /> <br />In effect, consumptive needs should be met by stream flow. If <br />there is more than enough water in the stream, we'll store the excess; if <br />there is not enough water in the stream, we'll draw on the storage. <br />If the storage diversion 01 were to have a higher priority than <br />the consumptive diversion 02, then the water would first be stored and <br />then released to satisfy the consumptive need. Thus we would be <br />pumping water which could simply have run down the stream. <br />One consequence of this reasoning is that in the figure above, <br />the reservoir may either fill or release (or neither) in any given month, <br /> <br />5.1.2 Diversions. Return Flows. and Offstream Storal!e: Diversions to off stream <br />storage are actually delivered via return flows using a type 3 diversion. The water may be delivered <br />to the target reservoir, or to any point upstream from the target reservoir. <br />If you deliver the water to a point from which it cannot possibly run downstream to the target <br />reservoir, you will get an error message from the ADDFLO routine to the effect that the reservoir <br />station is not downstream from the return flow receiving station (see Appendix D.4.4 [page 77]). <br /> <br />5.1.3 Return Flows and Offstream Storal!e: Return flows from offstream storage <br />diversions are trapped at the target reservoir. <br />This is the only situation in which return flows are not allowed to run free to the end of the <br />basin. The reason for the constraint is to prevent the water from cycling, as described in <br />paragraph 5.1.1 [page 29]. <br />Return flows accruing to the target reservoir in a given month are available during the same <br />month to serve diversions which use the target reservoir as a control reservoir. <br />With some restrictions, the return flows are also available for diversion between the receiving <br />station and the target reservoir. See the following case. <br /> <br />March 25, 1991 <br /> <br />HYDROSS 4.1 <br /> <br />Page 29 <br />