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<br />
<br />f.:~e"p;~~t-d~~ris:s~stbe . ye?ir of Phase II operations j.nthe Park
<br />e$Jfhe1'-l'C-W~ter-~esources Program, ope ra.ted by E. Bol1ayAs 80-
<br />.I~~.!JPith~,,]ptJ.teauof Reclamation under Contract 14-06-D..S640. The
<br />~;eOft~~p:l'O~i1'a!n1.$ to determine to what extent and under what,condi-
<br />'. 0t~.9:n:~:})~r~:c!~~trti()Jlin~tnOunta.inQusregion ~:an be augmented by artificial nu.,.
<br />(l[l~e~Qn~::"l'ht:J;'ep('~t,q:once.ntrates onthe wmter season 1 November 1965
<br />;'i::t~~:o-~~n:j~t 1966. ,Phase Iwork was devoted to determining the na.tural
<br />':eii,,~if~<n'~d,-~:~e~i.pitatiQn char.acteristics of the target area east of
<br />.j)o~t ing!$,,(J~iorado; PhaselIwork is determining how these char...
<br />y~~ ,.... an€iewh~nstorms are artificia.lly nucleated. Highlightls of the
<br />':a.'S(;Trt~.~tttA resJJ]ts' are: '
<br />
<br />.!t~~"~eJ.ve;re a:b~~909 hours of detectable precipitation in the target
<br />a1fe~~etwe~an:tNov~mber 1965 and lMay 1966; 220 of these hours
<br />w~r~ ~eeded'pr6dud.ngfisable preCipitation-rate histories between 80
<br />1 -. -" -. -. - - - ~
<br />andillOhouxslongat target stations
<br />
<br />,'- . ,1'1 ' . . " " ,.' <,'
<br />'i~dil:<J~~e<;l; s'e'~d~~g effects, are ambiguous because transport time from
<br />'t~e.~~lei gell:~:.cat()r.to the target is not known accurately. The maxi-
<br />m,:,u.;.'~,:'r,'Ve1;age~~f.ect"t,hat".,..COUld h.av. e ()ccurred in the targ.et ar, E:a i.8 i,n-
<br />dic~jjektto heH~bont8%for. allseeded storms; and a dommant :l:r.i.dlcat-
<br />~d,~fl~Gt>a;t1ih{~.Quthern..mos;ts,tatiQn in the target area tends to be
<br />'<i>:crt)~itim ed1b~~Ltl9WCOUr ~.~..dat a
<br />
<br />;,,"--. --:-~:_'- -';~ _-~I '--' _, _';<:-'->-:'" __:'._ ,_' :'_ '_; _---~
<br />;."_~l1LS~_$ra~ot)'s-~a.-il1dicate that in:rnany case s only portions of a storm
<br />':~.~J~~ed~Ql~3~ttldthat storms: which have temperatures colder' than
<br />".8op.~tthe-~~lt1fq:e,g%the-fi\1clei generator (8,300 ft. MSL) and a cloud
<br />"~~Iii~f:~t~1~O:Ol}~ftiM8tor less are most likely to be seedable in this
<br />~~pr(3rlroent; .
<br />., il . ,
<br />~-< - ~ -, -" ' - - - ,- : - - - - ,. - - .
<br />
<br />:~~'$tonte~~~i~en~ t'O.CQp.firtlitbi'ltthe 1 ~ ,.O~O ft. MS.L wind ~i.recti.on
<br />
<br />l~i~rCclXt'at~t~dlC~tlonof the mean art1.ficlal nucleI plume dIrection
<br />
<br />tptJl~ltaligf~h!~Q.a'nalysis ~fprecipitation-rate data indicate that our
<br />
<br />e$t~itna..tes ()ft~a:ns'Berttime tothe target tend to be low when the 11,000
<br />
<br />-:lii. ~;tiwi:n.:d:~pee.disused for computation of transport time
<br />,_ _: _ i:c ~I . - - ->
<br />s;lj~e~andZil't~sulfide a.~alY$'t$ of snow samples show that dilution
<br />
<br />.andtc.~ntaJxniJ1~iQ'l1are serious probl,ems-in both type s of analysis
<br />
<br />;;.<tp.e'*.~~i.$'~ee<if~rshoJ:tperiod(aroutld 5 minutes) sampling of snow-
<br />
<br />. Jl:h1gse~ded periods
<br />
<br />. 1-:, ::.' ~ -
<br />
<br />:.p~e~'itpttiarYc.~~f.t'fa-tcilogkaland physical an<;tlyse s point to target area
<br />ots;,qQO.to IO~:OOO ft.MSL altitude as being the most productive for
<br />se~~dt+gopl~r,atiQ'U$ in the Upp,er Colorado River Basin;1ikely targets
<br />fP::t~~~<)rth"'p;outh barrie r from Wyoming through Colorado, are the
<br />:f~:t':~t ~arril~l"i;'tt the Basin to air-mas s flow and do not include the front
<br />'l'.:an~e~of the Rocky Mountains.
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