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10 Journal of Weather Modification Volume 41
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<br /> Fig. 1. Map of the Val region showing the location of all the targets and controls, and the location
<br /> of the ground generators used for the original Vai program(blank chctes)and for the Vail-Beaver
<br /> Creek program(shaded piles). The white 1lcircle•encompassing the target stations is the intended
<br /> target area.
<br /> 3.3 Choosing the Best Control and, especially,which had the smallest standard
<br /> deviation of the residuals.Since GBH is near the
<br /> SNverman (2007) showed that it is imperative to center of the overall VaN target, it is used to rep-
<br /> use as the control or controls, to the extent that resent and illustrate the kind of results that were
<br /> available data permits, the streamflow station or obtained.The resulting linear and multiple corre-
<br /> the most precise results. He lotion coefficients, p, and standard deviations of
<br /> stations
<br /> that Old P
<br /> showed the control o or combination of controls that the residuals,se,for GBH are given in Table 2.
<br /> has the highest correlation with the target and,
<br /> especially, the lowest standard deviation of the It was found that the control that had the highest
<br /> residuals(differences between the observed and correlation with GBH and had the lowest stan-
<br /> predicted values) will yield the most precise dard deviation of the residuals was FRR. It was
<br /> evaluation results. also found that FRR was the best control for
<br /> each of the other targets. In accordance with the
<br /> The four potential control basins, by themselves regression ratio method (see Section 2), regres-
<br /> and in various physically meaningful combine- sion equations were derived by the least squares
<br /> lions,were regressed against each of the targets method for each of the targets that predicts the
<br /> to determine which had the highest correlation streamflow at the target station as a function of •
<br /> -Scientific Papers-
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