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<br />..~ <br />t'- <br />~'? <br />C.: <br /> <br />-, <br /> <br />.- <br /> <br />MAXIHI = User supplied parameter representing the maximum <br /> <br />interval (high) between grab samples in days. If the <br /> <br />grab sample interval is greater than MAXIHI, then the <br /> <br />program will ignore the grab samples bord"ring the day <br /> <br />of interest. <br /> <br />Valid = Valid if both bordering grab samples are in the same <br /> <br />season (primarily for drains abruptly aff"cted by the <br /> <br />irrigation season - in this context, rivers have only 1 <br /> <br />"season"). <br /> <br />Reasonable = Incorporates two checks on the calculated TDS. <br /> <br />Reasonable if both: <br /> <br />i) this day's EC is near or between the grab sample <br /> <br />. EC's, and, <br /> <br />ii) the calculated TDS is within PCT2 percent of the <br /> <br />TDS calculated using the long-term TDS-EC regres- <br /> <br />sian. <br /> <br />PCT2 = User supplied parameter representing the maximum allowed <br /> <br />percentage difference between the TDS calculated from <br /> <br />the bordering grab samples, and the long-term TDS-EC <br /> <br />regression equation. If PCT2 is exceeded, the long-term <br /> <br />regressions will be used in favor of time specific grab <br /> <br />sample information. <br /> <br />. <br /> <br />A-2 <br />