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<br />~ _':,:;::.:;,~:.~A';, ~:i'i<(-j,;-~',;"~,, ...-"",'< <br /> <br /> (\.1 <br /> r-- <br /> '\1 <br /> ," <br /> -, <br /> " ) <br />32 C~: <br /> <br />RIO GRANDE COMPACT COMMISSION REPORT <br /> <br />ACCURACY O~ 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 accuracy of discDarge data depends primarily on (1) the stability of the stage-discharge <br />relation or, if the control is unstable, the frequency of discharge measurements, and (2) the <br />accuracy 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. "Excellent" 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 <br />of the daily errors between these two limits than it does on the limits themselves. ~or this <br />reason monthly and annual records are much more accurate than most daily records. <br /> <br />Ii <br /> <br /> <br />Ii",." ",,";',i:. <br />.'J'.'I;;,;.t;K:_'__ 41;9; '" <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />..' <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />,~+*;',~"",v'-"";~\>~~"~J <br /> <br />~1~1~~~~ <br /> <br />~~;,:-,,-;,",>;.r,:....:.{'~tc~"~:~ <br /> <br /> <br />m <br /> <br /> <br />,.",.~~..")t.,:-4'~'-:'~ <br />~~~;~ji~~~~ <br />",~~"..~.. '~' ,'~ <br /> <br /> <br />.... <br />,;.' <br />'.' <br />