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<br />10 <br /> <br />o <br />-.J <br />~ <br />~ <br /> <br />example, the data collected on the drainage discharges provide a <br /> <br />means of properly evaluating the quantities of field tailwater and <br /> <br />drainage interception whIoh are present. This is computed from a <br /> <br />simple equation equating the products of the quantities and concentra- <br /> <br />tions of the inflows to those of the outflows. <br /> <br />A brief description of the subroutines and their function is given <br /> <br />in Table 1. <br /> <br />Subroutine WATER <br /> <br />The function of this subroutine is the compil<l-tion of the water <br /> <br />budgets from the input data and the calculations generated within the <br /> <br />program. There are six major segments included in the water <br /> <br />budget: (1) inflows, (2) canal diversions, (3) lateral diversions, <br /> <br />(4) root zone flows, (5) ground water flows, and (6) outflows. A <br /> <br />brief description of these quantities is given below, and a program <br /> <br />flowchart has been included for purposes of illustration in Fig. 3. <br /> <br />The definition of the variables can be obtained in Appendix A. <br /> <br />Inflows <br /> <br />The inflows to a hydrologic area include: (i) river inflows, <br /> <br />(3) tributary inflows, (3) imports, (4) ground water inflows, and <br /> <br />(5) precipitation. These quantities are usually read in as input data <br /> <br />and then summarized and totaled in the subroutine WATER to repre- <br /> <br />sent the available water to the area. <br /> <br />J;'" <br />