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<br />9 <br /> <br />o <br />....:i <br />~:.. <br />o <br /> <br />Main Program <br /> <br />The main portion of the program is used only to read in the <br /> <br />necessary input data for the calculations in the subroutines and to <br /> <br />control the order of computation. There a:\'e certain important <br /> <br />advantages in separating the data from the computations, including: <br /> <br />(1) Input order is irrelevant since data are available at <,-11 <br /> <br />stages of computatioll. <br /> <br />(2) Variable sets of data can be run through the model when <br /> <br />numerous budgets are desired, or if some form of <br /> <br />integration is desired. <br /> <br />(3) The subroutines are independent of input and, conSe- <br /> <br />quently, can be implemented in other computer programs. <br /> <br />(4) Corrections and adjustments are easily made without <br /> <br />detailed consideration to other phases of the program. <br /> <br />In addition to providing model control, the main program <br /> <br />separates the calculation of the water and salt budgets in order that <br /> <br />the modeling procedure involves only the water phase of the comp\lt<\- <br /> <br />tions. Although techniques are available in describing the salt flow <br /> <br />in terms of a model, the data obtainable in the Grand Valley are such <br /> <br />that once the water flow has been substantiated, it is simply a matter <br /> <br />of multiplying by salinity concentrations to arrive at the salt budgets. <br /> <br />However, examination of the salt flow system is necessary in order <br /> <br />that realistic adjustments can be made in the water b\ldgets. As an <br />