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<br />< <br /> <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). Details of the evaluation are con- <br />tained in the Final Report by Aerometric Research Inc.S 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 seeding 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 were 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 seedable situations with much <br />more certainty than before. The oveJLa.ll po:tent.i..ai.. 60lt .6eec:U..ng-pltpduc..ed in- <br />cJtea..6e.6 in plteupUa:ti.on dwu.ng a win:tvr. 06 avvr..age .6now6ai.l Wa..6 de.:teJtl'TJined <br />to be abou.t 10 peltc..en:t. The 1te6uU;.{.ng po:tent.i..a.l incJtea..6e in6tJteam6low 06 <br />abou.:t 19 peltc..en:t.fA 197 rrU.1lion m3 (159,000 a.cJte 6 ee.:t I 601t :the San Juan <br />Rtvelt. InClteme.n:ta.e. po:tent.i..ai.. ltun066 in an opvz.a..tional gltound mode.fA 186 <br />rrU.1lion m3 (151,000 aC!l.e 6ee.:t1 in the. TUo GlUlnde.. The :toW po:tent.i..ai.. in <br />:the.}:ifptJf1:b~ci~ undeJt an opeJr.a.tiona..t mode 06 win:teJt cl.oud .6eec:U..ng .fA 383 <br />million m3 (~'11~'He~~eI6ee;tl. <br />, ... 'i':.";".":./, I <br /> <br />4 <br />Hartzell, C. L. and L. W. Crow, 1976: WSSI <br />Basin Pilot Project, Report FR-3S9-46, Western <br />Ft. Collins, Co. <br />S <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 />