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<br />. <br /> <br />~ ' <br /> <br />. <br /> <br />model because the net flow is zero and thus, this implies no carrier !~,. <br />the salt. Also correlation of the net values with other streamflows is <br /> <br />difficult. <br /> <br />Present Model Status <br /> <br />The river basin simulation model is nearing the end of the current <br />phase of refinement and is being documented. Model runs are being <br />, <br />made for the Water Quality Office in the Engineering and Research Center. <br />The synthetic hydrology generation program has been revamped to <br />streamline computation procedureB and significantly reduce running time,. <br />1his alteration is essent~al1y complete and documentation of the program <br />is partially co~plete. <br />The demand input data program for summarizing detailed input data <br />is operational and a user's manual is available. <br />The tape edit program presently is not operational because of a <br />change made in the format of the large output disk file written by the <br />simulation model. Documentation is partially complete. The program <br />will be made operational in the near future. <br />The data analysis programs presently are not operational on the <br />B.ureau's CYBER 70 compu~er, not having been converted from the CDC <br />3800 status when used for the Western U. S. Water Plan Studies. Con- <br />version, streamlining, and program documentation for these data analysis <br />programs will be done in the near future. <br /> <br />Future Modellmprovement8 <br /> <br />The studies accumplished to date have shown areas where refine- <br />ments and improvements should be made on the model and associated <br />progr,ams. These are listed in two groups. the liret relating to the <br />synthetic hydrology generation program, and the second relating to the <br />river basin simulation model. <br /> <br />164 <br /> <br />;e-' <br /> <br />"'cOt', <br />,. :::u. <br /> <br />. <br /> <br />Sug~ested improvements for synthetic hydrology gene-ration: <br />1. Reanalyze the historic data base, incorporating as much of the <br />data for the basin as possible. <br />2. Add, as an option, the capability of generating total flow at <br />downstream stati~ns, but retain the present capability of generati~g <br />intervening inflows if 60 desired. The present treatment of intervening <br />inflOW8 as net values should be reexamined for the possibility of separat- <br />ing the inflow and outflow components. <br />3. Investigate additional techniques for computing mathematical a.nd <br />statistical parameters from historic da.ta and for regeneration of flows in <br />an effort to better preserve the characteristics of historical flows. <br />Suggested improvements for the river basin simulation model: <br />1. Additional streamli.ning of calculation procedures including <br />checking of input data for missing or bad d~ta. <br />Z. Activating and completing the capability of handling demands on <br />a priority basis. <br />3. Completing and improving the power generation computation <br />capabilities presently in the model. <br /> <br />Conclusions <br /> <br />Complex problems arising !rom past and proposed river basin de- <br />velopment can be studied over a wide range of conditions using simula- <br />tion models and large capacity computers. River basin simulation <br />models, such as described in this paper. present the opportunity to. <br />examine the results of a series of solutions. The use of synthetically <br />generated data allows analysis of the effects of a large number of flow <br />sequences and development of information on a probability basis. Some <br />problems have arisen during the development of this model and associated <br />programs and data base inputs. When documentation is complete the <br />river basin simulation model wiU be usable by others. <br /> <br />165 <br />