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<br />\ <br /> <br />< <br /> <br />INTIWDUC'l'ION <br /> <br />Tho U:ltor RO,;uul'ces Development CorpOrQtioll conducted a program to <br /> <br /> <br />:Ulcrease \d.nt"p proc:'..pitQtion over tho GrallC\ Mesa area in Colorado <br /> <br /> <br />in 1 'J'l'l on boho.lf of Grand Mo~a Hator L Gors Association. <br /> <br />The 197'i Iveather Modification Prognm represents the fifth year of <br />op~rations unuer a contract established in 1971. Previous operations <br />wore wrried ~ut in 19'11, 1972, 1975 and 1976. These years of opera- <br />tions \,'C1'e udermined by the Grand Mesa Viater Users Association, <br />after consultation \^lith ]'Iater Hesources Development Corporation. <br /> <br />ThiG l'eport >,ont:Jins a oummo.ry of the 1')77 oporations and a revie" <br />of the QctuQi }Jri'ciritabon thQt occurred during the period of con- <br />trnct \\Thieh \",,: ill dfect from 21 JQnuQry thl'ough 22 I1ay 1977. <br /> <br />The o.nalysis in this r2port is achieved uy comparing the actual pre- <br />cil,itation to ~stablishod normals. NormJl vJluos in this study are <br />lone-term montlLly l'1'ecipitCltion normals Qcquired in the years prior <br />to o.ny larGe scale cloudceedinc activities' in the United States. <br />This method of analysis aids in smoothing out the natural variability <br />of rainfall duo to topography 01' other local effects. <br /> <br />- 1 - <br />