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<br />Denver, CO.lC.l''-l<''i,), AjJl'i"l. 2, ]S'/~j....
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<br />r.lEMOHAHDUbl TO l,nt. r.. ll. JIAIJJER
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<br />Sllbjeot,: Pr(::v<:ntion oi' i'rr~o~i:l{~ in the Lll'.s.;ILy IJUin}:.' C:.lDElJ. - Colo:r'nclo-Big
<br />'fhQ::\pson !.~r().} 8ct.
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<br />J.. h..Q!.fll'S~. nClur011ce "1s IIlade t.,:.' t..j~o me].:ol'c~.cil~rll of DacA:11l:er >0,
<br />J.f)3f, t.o Mr. p. .J. Pr~st.'Jn b~' 0..1. bul.rd :,;n::.' ;'"1'. i~. JlI11E'~{ (.n thn ~nLJ~ct
<br />"GUJ.Clll~tiOTLS elf \'iut€lr tr..:f1pC!"[1t":Jrf::_: ia tho (;run((~' >lU;Il"i C,t::.::J ~Gr r;~_f.rt;!rf:nt
<br />limQtU'lt~ of fJ O'i,' t.() cletonrd.21o tJ-.e. };of.=:ibiJ :i..t.~.: (Jf t.l!.u [01'111':1 :~.im.l "d' ire. It
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<br />2. P"os' b" ih, ~.e ",...(,~i',., ,11-"'; -,. 00'" cc-.Jc Of' "., (']f!" '~I,,, stu.d'.!
<br />.~~.......~:.tl~.;X~/J&.....___~.~~.~_'"I-"'."'_.__~--t...'-:::I:._C:_._.
<br />rOiBrf'vd to ~!LJO'JI) ...JuE. li.::..f,e( on tl!ilCW:t:.'. of flo\;"l r<JngiHg fl'(lr:1 ~~50 t.r: gOO
<br />ellLie fe€.t Del' so(:onr1. lJr, tJ:.Lo: im~:i:: ,'j)~G with n ~8r~i31 ::('n~'til of ':Ol~!'" E\iJ;;:Li
<br />In,d telap8rl-Jt',..u:"85 Qf 400 iT. l.,.(';lc'.'1 ZC".l'O, i!., W.:..i.fi (:Ol~C'~ ~:d.ec th;'lt nQ icE' would
<br />forw if thl! 'sate!' t~';J.!JP.l'l;tU!"F:S nT.. ti~c ::.lIt.[Llcu YI\',J'e ))0 }i'. or <:ibove.
<br />
<br />It. is cante::iFlbt..~, hOW'3V01', th.:. t. t.ile p!mlpi..."'1r. will b(' t:O!'e bi t.~e
<br />off-pe;.::L I=,r:.l'iods I:ttld U-.or1? will 1:.ho:rei'(Jre 1)e pErtO(~S \"then t~cre ','/"1-T1 }J(~ n('
<br />flow in thu canal. In ~!L".:~ con.llcctlor., tLe que::rt.ion ~1a~: bean r3.t:::oa ns to
<br />TILet:'1rn" j.t WOl.1Jd 'be pos~.iblG fer J'r(:c::.i!:f,; t:.1 ocellI' in the quiet ~)~rlodf",
<br />dJ1(j, l~' DC', t'lou.lrl suffi.ciEnt ice ht~~ i'(JI'l.le(; '~.C.l cLiu:;e truulJle \'!h(;r~ j"'!\.~l~inC is
<br />resuIIloo .
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<br />An imj,':lOrtllnt fuet l1Lich nLG n be!"lrLJI.' l.Jn (his '1untd::i.0i1 ic; that
<br />'lwter revches It..~ r.liixjJ:!l1l1l 6.1m~;it:--. het.;"j(H.::r! y) Llf~r! ~tj de[.l'f:es 'r'. In locult-
<br />t.io:=J WhCl'(~ t;1C ten~?Cl'uturf':':: c)lOp sul'!'ic:i.e\"ltl~,' 10-.:, 1.111:'1 l't.llj.ng t.efLlpf"ratureG
<br />in tho tl~..:.tllr.lIl m:ci ,,;inter !.10YJtrj.....; CL;U.'18 .... '\'srtir.;~~ .-..~]'ciilHt.ion of wc.ter in
<br />:lak&:; due to 1..1.8 sin:tiJ-.f; of th(~ ::l1ri't.cc: i'i;;(,~r i"!~~icr'! he~ be8;) in(;rr~.:J8ec1 in
<br />density dile t.o Goclirlf.:. 'l'hi~ l)r0('!::r::(~L L!d..:i..~~ t.t,~ t(H~)1('r~LurC1 of !:lwy.ir.n-:m
<br />den~1 ty 5.5 rct:,:Lf~ll, af"Li:.-r wj-;ich l~lJ:\r ::."l..u.t1tfJr ('.1,)0] L1l: 18.:.(~:; tc :3tG11iJ it;,'. If
<br />the "1u3t.hQl~ rer..:nir:n {."c:jcj, so!~e fITV~Cl' l(.,:-.;je~j ~'{ill QCcur tllr:::1ugb t!w procct;~
<br />of diffu~ior" bl~~. t.i~lin is V8!'~- s)o~!1 c.~~(: 'r!l"~ Jb\e ....J~:ter .~s 'U5'..lElJ.ly nt t!:t0
<br />t.em.pcrntur(~ ("If J;'L(\Xi;'I\':/L d.c;,~)it..y i':'r~'l~, tLO::I ',:'.)1. Lf1J': 1 (J a pol:lt. Ju~li.. .r"~]lJw the
<br />Dltrf'flce i)f ~..!ie ice. Tht.~ sl.u"fEicQ CO(J~-'Ll,;' l",.;..r~Ct. "r.i.l1 not r(}LGr~ much f;:l.tfJer
<br />thup. gL,.:Jld. ten feet. bs~(\vJ t[:.~ l)otl~(;;,l (Jf t!'H.~ ~i.('(., dln'in~ t.hi~ :iintr::r.. :::';:i.~~cc
<br />the :i.~Jti:k:e ~t Cr:)!1t);}' 41:0 i:-3. r.r;i;I' t.:.:1"' 'Uot-t.orl, :.t L,,: t~) '~e ~z!)octcrl tl1nt the
<br />t'i'ster jJtL":lped ir:tc t.he ct:r.i.lJ.l ,'!i.1J. i:p .!"L ;ibl)U'C .Y/) F' or 701". uuc,'Jr: tho
<br />fro,>zil1f. point.
<br />
<br />If tJj(.~ curl::J. h:::J.8 a 2l~-i'oot buttOlil i';i.~'U'., n lC',,~;-fc;ot ",t>.t(1r 'lcpth,
<br />ond 1.5 to 1 ~j do fil()pc~i, the f>iJrf(lct~ wi.f_'it.!1 ':::!.~ l b€.' 0~).) ff~l)t. and the 1'olJ l)W-
<br />i:1g uuta '."/ill apply for a I-foot length:
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<br />20
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