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<br />4 <br />These activities are reported in detail in the WSSI Final Report. No pre- <br />vious project of this type has amassed as much data of such high quality. <br /> <br />This executive summary reports the analysis. and evaluation of CRBPP <br />data by Aerometric Research Inc. (ARI). D,etails of the evaluat:Lon are con- <br />tained in the Final Report by Aerometric R,esearch Inc.5 The difficulty of <br />this task was increased because post-facto analysis of data showed that <br />many of the clouds actually seeded were not of a suitable type. In <br />addition, on some experimental days weather did not develop as forecast, <br />and little or no snow fell. In numerous cases seeding material remained in <br />the area beyond the planned experimental sleeding periods. On other days <br />rapid weather changes produced conditions under which seeding decreased <br />precipitation. <br /> <br />As a result, the total unstratified statistical analysis found no dif- <br />ference between precipitation on seeded experimental days and control days. <br />However, when days of missed forecasts wer,e removed, and data from experi- <br />mental days were reduced to six-hour time blocks to improve the correlation <br />between meteorological covariates and precipitation, increases during <br />certain classes of seeded cases were statistically significant. <br /> <br />The analysis has enabled identification of seedab1e situations with much <br />more certainty than before. The OV~ potential 60~ ~eeding-p~odueed in- <br />~e.M~ in. p~eupLta..:Uon dWLing a. wintVt 06 a.veJLa.ge ~now6a..tt WM deteJf.1rlined <br />to be. a.bout 1 0 pe~eent. The ~uu.U.ing potential. in~eM e in .6~e.am6.e.ow 06 <br />a.bout 19 pVteent ~ 197 m.U.Uon m3 (159, 000 a.~e 6eetl 6o~ the Sa.n Jua.n <br />1U.ve~. In.~ementa..t potential ~un066 in a.n opeJl..O..:t.iona..t gMund mode ~ 186 <br />million. m3 (151, 000 a.~e 6eetl in the Rio GMooe. The tota..t potential in <br />the :two bMiM uooVt a.n opVta.tiona..t mode 06 wintVt cloud ~eeding ~ 383 <br />million. m3 (311,000 a.~e 6eetl. <br /> <br />4 <br />Hartzell, C. L. and L. W. Crow, 1976: WSSI <br />Basin Pilot Project, Report FR-359-46, Western <br />Ft. Collins, Co. <br />5 <br /> <br />Final Report, Colorado River <br />Scientific Services, Inc. <br /> <br />Elliott, R. D., R. W. Shaffer, A. Court, and J. F. Hannaford, 1976: <br />Colorado River Basin Pilot Project Comprehensive Evaluation Report, Report <br />No. 76-1, Aerometric Research Inc., Goleta, Calif. <br /> <br />-3- <br />