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<br />o <br />....:1 <br />w <br />00 <br /> <br />CHAPTER 2 <br /> <br />MODEL OPERATION <br /> <br />The mathematical model proposed herein is a digital computer <br /> <br />program describing the hydrologic and salinity conditions of the <br /> <br />Grand Valley in west-central Colorado. Because the general concepts <br /> <br />describing the area are not unique, simple modification of the program <br /> <br />can be made and extended to other areas. The program is comprised <br /> <br />of individual subroutines in an attempt to attain a measure of Hexi- <br /> <br />bility during operation by delineating the calculation of various phases <br /> <br />of the model. By structuring the program in this manner, several of <br /> <br />the subroutines become optional if their functions can be read in as <br /> <br />data, or if certain outputs are not desired. The general scheme of <br /> <br />the program is illustrated in the schematic flowchart shown in Fig. 3. <br /> <br />The time scale used in any study of natural phenomenon is <br /> <br />important because of the many interrelated variables fluctuating during <br /> <br />the time period. For the purposes of hydrologic and salinity budgets, <br /> <br />the time scale is on a monthly oasis with annual sums also presented. <br /> <br />The water and salt budgets are expressed in terms of acre-feet of <br /> <br />water or tons of salt. <br />