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<br />"':-~i'~,,:;.f~/: :i.:!~';;i;;."~(i,t.::',[' <:'l~"i: ::"i'3:~_"'~~'.';~''-\o.i'.,:r,,'_:'':t.C'.:;.o...1.--'''':':'::'-.''''U~;.,,\, !i.., ',oj_ _"'~ ,'",-,-. " <br /> <br />41 <br /> <br />(Y') <br />(T) <br />O? <br /> <br />:.. .) <br /> <br />RIO GRANDE COMPACT COMMISSION REPORT <br />ACCURACY OF RECORDS <br /> <br />\..._J <br /> <br />'--~ <br /> <br />The Rules and Regulations of the Commission state that the equipment, method, and <br />frequency of measurement at each gaging station shall be sufficient to obtain records at least <br />equal in accuracy to those classified as "good" by the U,S. Geological Survey. Within the <br />physical limitations of stream gaging, the agencies obtaining the records at Compact gaging <br />stations have complied with these regulations. <br /> <br />The accuracy of streamflow records depends primarily on (1) the stability of the stage- <br />discharge relation or, if the control is unstable, the frequency of discharge measurements, <br />and (2) the accuracy of observations of stage, measurements of discharge, and interpretation <br />of records. <br /> <br />The station description states the degree of accuracy attributed to the records. <br />"Excellent" means that about 95 percent of the daily discharges are within 5 percent of the <br />true value; "good" within 10 percent; and "fair" within 15 percent. Records that do not meet <br />the criteria mentioned are rated "poor." Different accuracies may be attributed to different <br />parts of a given record. The probable error in a monthly or annual mean discharge depends <br />more on the distribution of the daily errors between the limits than it does on the limits <br />themselves. For this reason, monthly and annual records are more accurate than most daily <br />records. <br /> <br />,~.,;..,,,,..,::.",,..p'1 <br />