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<br />OiltHg- <br /> <br />1.2090(....'1 <br />llutNoJ d 11"""",_ <br /> <br />TECHNICAL REPORT STANDARD TITLE PAGE <br /> <br />I <br /> <br />I. REPOJ1T NO. I:, Z;~MEHT ACCESSION ~ 3. RECIPIENT'S CA TAlOO NO. <br />R-93-3 <br />. TITLE AND SUBTJTLE Validation of Precipitation Management 5. RE"",RT DATE <br />by Seeding Winter Orographic Clouds in the Colorado February 1993 <br />River Basin 6. PERFORMING ORGANILA TION CODE <br /> 0-3720 <br />7. AUTHOAlS) ,. PERFORMING ORGANIZATiON <br />Arho B. Super, John C. Lease, Jack T. McPartland REPORT NO. <br /> R-93-3 <br />9. PERFORMING ORGANIZA.TION NAME AND ADDi=lESS 10. w:;lRl( UNIT NO. <br />Bureau of Reclamation 11. CONTRACT OR GRANT NO. <br />Denver Office <br />Denver CO 80225 13. TYPE OF REPORT AND PERIOO COVERED <br />12. SPONSORING AGENCY NAME AND ADDRESS <br /> OIBR <br />Same <br /> 14. sPONSORING AGENCY CODE <br />15. SUPPLE"-ENTARY NOTES <br />Microfiche and hard copy available at the Denver Office, Denver. Colorado. Ed: rn <br />16, ABSTRACT Reclamation (Bureau of Reclamation), in coopeution with the Colorado River Basin States. developed a <br />.lflan for a prt'eipiUtion management demonstration Pf"DlP:aal titled the CREST (Colorado River Enham:ed Snowpack <br />esl). The pl'l)gram's PUZOtlt' is to develop scientific eVIdence that properly conducted ~o.g of winter orogralhiC <br />(mountain.induced) clou can significantl)' increase high elevation sDOwfall in the Colorado River Basin. he <br />multiwinter m,-:tude of the preclPltation Increase will be quantified at two mountain locations typical of the Upper <br />Colorado River asin. <br />StatisticaJ analyses of some operational aod experimental projects in the western United SUles and elsewhe~ bave <br />provided strong todlcationa of snowfall enhancement from winlA.>rorographic cloud seeding. How......er. supponi.ng phvsical <br />documentation i. lacking. The propoaed pror,am will build 00 the strength of past ell;perience and results to proVIde <br />conV\ncUlll' physical and 5tatistical evidence t at cloud -din6" can signilkantly enhance the mountain soowpadi. <br />The program will bt>Wn with environmental oompliance activities, aod procurement of COOtracts Ind equipment. Both <br />ell;penmenLal locations will theo have a tbn>e.winter physical ell;pe~ot phase, followed by a four.winter statistklll <br />phYSIcal thue. <br />. Tbe ~SicaJ phase will be devnted to ~ditect detection" expenmenta which will monitor the major links in the chain <br />?f phys' events following,seeding. The purpose,of this phase is to markedly in~ue s'!;,ical undern~ding of the <br />Im8jrlant cloud aod PI'e'(:1~lt3.hOn pr0ce55l'S to WlOter clouds. and how they are affecte y 5l'<:!ding. This ph~ will <br />va -date the physical hypot esis of wlOlA.>r orographic cloud lIOOdin~ and document the ranRe ofmeteoroloRical conditions <br />under which it is acplicable. This understanding is needed for deSIgn oCtile second phase. <br />. The statistics physical phue will consillt of . randomized seedinf program with a stronK physical monitoring <br />lXImponent. The purpose of this ~hue is to demonst1llte that IDO....faJ can be increa5l'd over a. t~t uea over a <br />mUltlwlnter period. and to quantify the malfMtude of the increue. The statistical urriment will ngorously test a <br />p~ely stated hypothesis.. usiOft Illredetemuned seeding and observational cnteria. an confirmatory analysis. At the <br />same ume, exploratory anallsis W1 be used to broaden undef!ltanding and applicability of the re!lultl;. AsJy statistical <br />resulu must be physically p auslble to be considered convincing. <br />The combinatIon of c:onflTmatory lltatistical analysi.-. and supporting physical obolervations for a luge subset of the <br />experimental units. is ex~d to provide tbe scientific evidence needed to plaC:e this developing technolo~ on a much <br />firmer foundatIOn. The reI'lUltlO~ technology is expected to be readill. transferrable throullhout tbe Colorado iver Ba.ilin. <br />and. to I les..<\oer degree, to ot ..r mountain reSOl1.S of the worl . To upedite the transferability of the tecb.nolo/Z' <br />throullhout the Basin. more limited obS('rvation p~1lIIlS and numerical modeling investiltatio05 will be conduct.e-d or <br />other representative mountain re!tlOl1.S during tbe C ST program. <br />17. <EY 'WORDS A"lD OOCUMENT ANAL VSIS <br />a. DESCRIPTORS- atmospheric research! meteorologyl weather modification! orographic <br />clouds! cloud seeding! meteorological instruments <br />b. IDENTIFIERS- American Meteorological Societyl Council on Environmental Qualityl <br />Colorado River Basin Pilot Projecti Colorado River Enhanced Snowpack Testi Fish and Wildlife <br />Coordination Acti High Plains Cooperative Program ExperimentJ National Center for <br />Atmospheric Research! Sierra Cooperative Pilot ProjectJ World ~feteorological Organization <br />c. COSA TI Field/Group 048 COWRR: 04 02.1 SRIM: <br />18_ DISTRIBuTION STA TEME NT 19. SECURITY CLASS 21. NO. OF PAGES <br /> _....., 158 <br /> -., <br /> 20. SECURITY CLASS 22. PRICE <br /> (T..,....ID <br /> -., <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />, <br />,- <br /> <br />'-' <br />