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<br />There was no western portion of the control area since the Kansas Water Office was <br />unable to acquire crop hail insurance data for Colorado counties for each year of each <br />of the two time periods. <br /> <br />Crop Hail Insurance Data <br /> <br />Crop hail insurance data were acquired from the Kansas Insurance Department in <br />Topeka, Kansas for the time period from 1964-1970 and 1979-1993, with the exception <br />of calendar year 1990. Data for this year were provided by Curtis Smith, Program <br />Manager, of the Western Kansas Weather Modification Program. Crop hail insurance <br />data for the time period from 1948-1963 were provided by the National Crop Insurance <br />Services in Overland Park, Kansas. <br /> <br />Analvsis of Hail Suppression Data <br /> <br />The effectiveness of the cloud seeding operations in suppressing hail damage was <br />measured by using a hail-damage loss cost analysis. Loss cost isa ratio found by <br />dividing the insured crop hail-damage loss by the insured crop hail-damage liability and <br />mUltiplying the result by 100. Historical records show that hail-damage loss cost <br />percentages decrease from west to east across Kansas. The double ratio analysis screens <br />out differences between the target and control areas that are due to regional differences <br />in hail-damage intensity. <br /> <br />The following three equations were used to detennine if the Western Kansas Weather <br />Modification Program has been effective in reducing hail damage in the target area. <br /> <br />R1 = T1 + C1 ' where <br /> <br />, <br /> <br />(1) <br /> <br />T 1 = the average hail-damage loss cost ratio for the target area during the time' period <br />from 1979-1993, during which cloud seeding occurred in the target area and <br /> <br />C 1 = the average hail-damage loss cost ratio for the control area during the time period <br />from 1979-1993. <br /> <br />R2 = T2 + C2 ' where <br /> <br />(2) <br /> <br />T2 = the average hail-damage loss cost ratio for the target area during the 1948-1970 <br />time period, during which no cloud seeding occurred and <br /> <br />C2 = the average hail-damage loss cost ratio for the control area during the 1948-1970 <br />time period. <br /> <br />DR = R 1 + R2 ' where <br /> <br />(3) <br /> <br />ratio R 1 reflects the results of cloud seeding on the target area hail-damage loss costs <br /> <br />14 <br />