INVESTIGATION OF THE QUANTITATIVE DETERMINATION OF POINT AND AREAL PRECIPITATION BY RADAR ECHO MEASUREMENTS.
Quarterly technical rept. no. 7, 1 Apr-30 June 63,
ILLINOIS STATE WATER SURVEY URBANA
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Three raindrop cameras were operated on the East Central Illinois Raingage Network. Because of drought conditions only 38 rolls of raindrop camera film were obtained. A portion of these data was edited to determine if the data were appropriate for detailed analysis. Processing of the raindrop camera data has been continuing in a routine manner. Sixteen rolls of raindrop camera data were measured and preliminary calcu lations performed. Since the original objective of this contract was to determine measuring tech niques for radar measurement of rainfall, the correlation between the rainfall rate and the radar reflectivity has been re-examined, utiliz ing the assumption that the measurement of Z was quite accurate. Because of the change in the computer facilities in the University and the requirements of a smaller Z increment, the pro gram for obtaining the best estimate of rainfall rate given a particular radar reflectivity has been rewritten for the 7090 computer. This pro gram has not been checked as yet. Work has been continuing on the estimation of the evaporation effect on raindrop size distributions, and a short synposis of the findings and sample effects on drop size distributions are presented. Author