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<br />t~i~,'i,t ~,};i~~1:J&.~~~::' <br /> <br />;,~? ;;~___ -_;,;,;". ..'.',c; "';;'~';' -.,n::;";;', ,.-,','0," ..~,I~"- ..'_.. <br /> <br /> <br /> ~ <br /> If) <br /> ; <br /> -j <br /> '. ) <br />32 -- <br /> <br />RIO GRANDE COMPACT COMMISSION REPORT <br /> <br />ACCURACY OF RECORDS <br /> <br />The Rules and Regulations of the Commission state that the equipment. method. and frequency of <br />measurement at each gaging station shall be sufficient to obtain records at least equal in accuracy <br />to those classified as "good" by the U.S. Geological Survey. Within the physical limitations of <br />stream gaging. the agencies obtaining the records at Compact gaging stations have complied with <br />these regulations. <br /> <br />The <br />relation <br />accuracy <br /> <br />accuracy of discharge data depends primarily on (1) the stability of the stage-discharge <br />or, if the control is unstable, the frequency of discharge measurements, and (2) the <br />of observations of stage, measurements of discharge, and interpretation of records. <br /> <br />The station description states the degree of accuracy of the daily records. nExcellent" means <br />that about 95 percent of the daily dischargeS are considered to be within 5 percent of true value; <br />"good" within 10 percent; and "fair" within 15 percent. "poor" means that daily discharges have <br />less than "fair" accuracy. <br /> <br />The phrase "within 5' of true value" used to qualify "excellent" records establishes the <br />extremes of the probable errors for 95. of the days in a given period of time, The word "within" <br />defines the range of errors with individual daily values falling between 95. and 105. of true <br />value. The probable error in a monthly or annual mean discharge depends more on the distribution of <br />the daily errors between these two limits than it does on the limits themselves. For this reason, <br />monthly and annual records are much more accurate than most daily records. <br /> <br />~ <br />G <br />:,~ <br />r <br />,;' <br /> <br />I;' <br /> <br />-, <br />Ii: <br />~, <br />~; <br />~ <br />~ <br /> <br />:', <br />" <br /> <br />:1 <br />I ~;j <br /> <br /> <br /> <br />'...,::~\$~"i~'-;~~ <br /> <br /> <br /> <br />~:'" <br />,- <br /> <br />,- -'~' <br />