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<br />/l.~:,'':'':'', "-' ~'j."" <br /> <br />n""""'-~. <br /> <br />, ( <br />C\1 <br />(:D <br />f....... <br />C: ) <br /> <br />....,-' <br /> <br />RIO GRANDE COMPACT COMMISSION REPORT <br />ACCURACY OF RECORDS <br /> <br />32 <br /> <br />The Rules and Regulations of the Commission state that the equipment, method, and frequency of measurement at each <br />gaging station shall be suffident to obtain records at least equal in accuracy to those classified as -good - by the U.S. Geological Survey. <br />Within the physical limitations of stream gaging, the agencies obtaining the records at Compact gaging stations have complied with <br />these regulations. <br /> <br />The accuracy of streamflow records depends primarily on m the stability of the stage-discharge relation or, if the control is <br />unstable, the frequency of discharge measurements, and (2) the accuraCy of observations of stage, measurements of discharge, and <br />interpretation of records. <br /> <br />The station description states the degree of accuracy attributed to the records. -Excellent means that about 95 percent of <br />the daily discharges are within 5 percent of the true value; "good" within 10 percent; and "fair" within 15 percent. Records that do not <br />meet the criteria mentioned are rated "poor. ~ Different accuracies may be attributed to different parts ofa given record. The probable <br />error in a monthly or annual mean discharge depends more on the distribution of the daily errors between the limits than it does on <br />the limits themselves. For this reason, monthly and annual records are more accurate than most daily records. The number of <br />significant figures and rounding limits used are those as employed by the U.S. Geological Survey. <br /> <br />___....~" .,~_.~,..,~, ",...;.!i:, <br /> <br />, <br />I <br /> <br />Ii....'. <br />;. <br />; <br />~, <br />i~ <br />~l <br />~ <br />~~ <br />{l~ <br />~-;-~ <br />>:;. <br />,;\ <br /> <br />.' <br />f,.~ <br /> <br />"" <br />