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WSP11570
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Last modified
1/26/2010 3:18:03 PM
Creation date
10/12/2006 5:03:24 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8111.807
Description
Arkansas River Compact Administration - Stream Gage Evaluation
Basin
Arkansas
Date
1/1/1980
Author
USGS
Title
Cost-Effective Stream Gaging Strategies for the Lower Colorado River
Water Supply Pro - Doc Type
Publication
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<br />1 <br /> <br />1 <br /> <br />1 <br /> <br />I <br /> <br />1 <br /> <br />1 <br /> <br />I <br /> <br />I- <br /> <br />1 <br /> <br />1 <br /> <br />1 <br /> <br />1 <br /> <br />1 <br /> <br />1 <br /> <br />I <br /> <br />1 <br /> <br />1 <br /> <br />1 <br /> <br />I <br /> <br />is used by an experienced hydrographer to compute a discharge record whose <br /> <br />accuracy can be evaluated by comparison with the measurements in the <br /> <br />control gro~p. The process is repeated several times; each time some of the <br /> <br />discharge measurements are shifted from the control group to the analysis <br /> <br />group. As the amount of data in the analysis group increases, the accuracy <br /> <br />of the record tends to increase, that is, the differences between the control <br /> <br />discharges and the concurrent computed discharges are less on the average. <br /> <br />Such a relation can be expressed graphically as in figure 4, which shows <br /> <br />the results of a Burkham-and-Dawdy analysis of the discharge rate at the <br /> <br />Colorado River below Davis Dam (station 09423000) for the water years <br /> <br />1956 through 1958. This period of record was chosen because of its high <br /> <br />frequency of discharge measurement. The points in figure 4 specify the <br /> <br />repetitions of the Burkharn-and-Dawdy process with differing amounts of data <br /> <br />in the analysis group. It should be noted that the analysis does not seem <br /> <br />to point toward an error of zero with continuous measurements as statistical <br /> <br />sampling theory dictates. Some possible reasons for this will be discussed <br /> <br />later. <br /> <br />Subsequent studies of the accuracy of discharge records are reported <br /> <br />by Herschy (1978). However, these later procedures are of little value to <br /> <br />the current problem because they ignore the effects of the temporal correlation <br /> <br />of errors in the discharge record. Because the correlation in time of <br /> <br />discharge errors or estimate is positive, the procedures espoused by Herschy <br /> <br />(1978) probably tend to underestimate the error in daily, monthly or annual <br /> <br />discharge. <br /> <br />A technique that has been shown to have promise in the determination <br /> <br />of the accuracy of water-quality records is Kalman filtering (Moore, 1978). <br /> <br />15 <br />
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