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<br />-~ <br /> <br />,.-e~' <br /> <br />tudies average monthly data are usually sufficient. L <br />lelmeoporatin ~r"m. may be dependent upon in~t~ telemetry <br />I <or input. Time fr~~ other programs cotdd'Iall between these ex- <br />.remea. Availability of dati'"tor the_diif~ lime units is one (actor in <br />'~equiring different models to 8e~dlfcerent ends. Internal logic require. <br />../ ~. I' n <br />"'nents olten vary dranlatically. For example;.. -t_~me ag 11'1 stream ow may <br />'ot be partiCUlarly'~~rtant in annual ~r month~in~mes. How~ver. <br />~t is u8u~'a~utelY essential that thu time lag be recogl'l~d 11'1 dally <br />:>r even weekly unit.s. <br /> <br /> <br />140 <br /> <br />. <br /> <br />. <br />~$t.. <br /> <br />STREAMFLOW SIMULATION WITH THE COLORADO <br />RIVER SIMULATION MODEL <br /> <br />by <br /> <br />Charles W. Huntley. R9bert B. Main, <br />and William L. Lane. <br /> <br />Introduction <br /> <br />This paper discusses a computerized river basin 'simulation model <br />and its application to the Colorado River Basin. The model was develop- <br />ed to provide the user with the capability of varying demand and hydro- <br />logic inputs at points throughout the basin, thus, permit~ing an examina- <br />tion of the e!fects of these, variatioDs on water availability and salinity <br />concentrations in the basin. <br /> <br />The purpose 01 the paper is to discuss the concept and capabilities <br />of the model. Although example results of a typical run are included to <br />illustrate capabilities of the model. the purpose is not to present or dis- <br />cuss results of a study. Node structure and reservoir demand. and <br />hydrology inputs are discussed. Salient po;,nts of the model operation <br />are summarized. Output options are listed. Special features -of the <br />model required for adaptation to the Colorado River Basin are an im- <br />portant part of the paper. Example results of a typical model run and <br />associated costs arc included. <br />This model was used for the U.S. Western Water Plan studies in <br />1974. Since that time, substantial improvements have been made in. <br />the model to enhance usability irom the user standpoint. to significantly <br />reduce running time and costs, and to streamline calculation procedures <br />in the model. The model is currently being used in the E,ngineering and <br />Research Center for examination of a variety of s,alirlity questions on the <br />Colorado River. <br /> <br />.Engineering and Research Center, Bureau of Reclamation, U. S. <br />Depa. rtment of the lnteriQr, Denver, Colorado. <br /> <br />141 <br />