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<br />00255S <br /> <br />(8) Changes in raindrop size distributions within a given storm <br />result in significant changes in the R vs. Z relationships. <br /> <br />(9) Changes in the average R vs. Z relationships between storms <br />are greater than changes within a given storm. <br /> <br />(10) Of the various R vs. Z relationships used with the radar <br />measurements, the greatest .improvement in radar surface rainfall <br />estimates resulted from relationships derived from the PMS <br />measurements. <br /> <br />(11) Relationships derived from correlations between measurements <br />of the low-response surface gages and the high-response radar <br />result in radar estimates of surface rainfall which are relatively <br />inaccurate. <br /> <br />(12) The gage/radar relationships derived from measurements in <br />gage clusters result in radar surface rainfall estimates which are <br />slightly improved over those derived from an identical number of <br />gage measurements spaced evenly throughout the network. Although <br />confidence cannot be given, statistical considerations indicate <br />that the area representiveness of the individual gage measurements <br />is minimized in the gage cluster arrangements and, therefore, <br />results in relationships which are likely to be more accurate. <br /> <br />(13) Although this study did not investigate the possibility of <br />further improving the surface rainfall estimates from those <br />obtained from the various R vs. Z relationships, the results <br />indicate that the reliability of radar rainfall estimates will not <br />necessarily be improved by adjusting the radar estimates by a <br />single GT/RT ratio value. This is due to the high probability <br />that the exponent of the gage vs. radar comparison equation <br />differs significantly from the value of 1. <br /> <br />(14) No significant degradation in radar estimates of surface <br />rainfall over a large area results with the less frequent acquisi- <br />tion rate of 0.2 rim. <br /> <br />CONTRACTORS: Kansas-Colorado-Nebraska <br />CONTRACT NO. 14-06-0-7544 (Memorandum of Understanding) <br />PRINCIPAL INVESTIGATOR: Not appplicable <br />PERIOD: July 1,1974, to September 30, 1978 <br />FUNDING: None <br /> <br />The States of Kansas, Colorado, and Nebraska, and the Bureau of <br />Reclamation signed a Memorandum of Understanding to acquire and <br /> <br />III -9 <br />