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<br />.. <br /> <br />-. <br /> <br />:xiii <br /> <br /> <br />o..lsnowfaILQ.ver-.!he~_ount~,s ~'y~",~cdjng..ajr Jllil~~S_ fr~n the Pa~ific OCea!l <br />win not produce any detectable deplction of pJccipiUltion on..thepla!.gs. ~ <br />e~, silver iodide and ice crystall) from the m~unlains arc rran$p.orted Qut onto <br />the lains and could, under Some conditions increase recritation from tne <br />storlll systems over the plains. This could be IniJlimizcd by careful cpntrol of <br />seeding, so that the. cities of the eastern slope of the Rocky Mountains arenol <br />subjected to unusually heavy snow storms. <br />An average annual increase of the virgin flow of L,Ma:.f f~~c Opper <br />Colorildo Rivcr Basin will result in the addition of ilbout 700,000 torts of di~- <br />solved geoJOJ!i~f~l~rals to the rivcr annually. TJ1is compar~ t~~.3verage <br />allj)u:l1 <Iissolvc,l miDPqL1.lli1.d before anY-.gevclopmentbLman.9f 5.1 million <br />Ions and an uverag,c. for the J 942-61 period of 8.4 miilion tons. WOSA al.l,g- <br />mentation would, however, reduce the average dissolved salt..-concemration, <br />whkh was 610 Rafts per milliQ!!.Jor the f963-67 period. by about 41 ppm ~ <br />ule dividing point between the Upperaod Lower Basins. A more significant <br />effect on water quality will be that resulting from the USes to which the water <br />increment is applied. Accord~~~ly, the serious. water quality problem of the <br />Colorado ',' be si ]ticantl' 'm roved b r WOSA and m b~ made <br />mu<i.. worse if it is used 10 bring addition~LJillliIs J1ltll~r irrigntinn l'f for indno:- <br />trial development th:Jt i.: hig'-1ly polJl1line SJl("h,a~ nil "h~l~ de.vf>Jnpmcpt. Under <br />any augmenration eventuality, numerical salinity limits should be established <br />for the CoJt)rado River and <l comprehensive W<lter quality management pro- <br />gramshould be initiated. ' <br />S~e 2 Mat of alle~~'Il be expe~ted to producc.m <br />annual suspended scdi.mrm in/'rease of 12.S--l11i.1li.oU-lnn<; Most of ,hI" :WO"-1i"ftl" <br />be trapped in Lake Powell 811d other Colarado.-Rivr.r Storage p[Q~t..B~: <br />ervo~ thus n:..-ducing their W~II'r ~tor.a.g~ Cilp:lcit}W\nd lIsefllllife. <br />Without contra) measures, WOSA "",'ilI increase the probability of ava- <br />lanches aud floods. The probability of avahmchcs depends stron&ty on rela- <br />tively small amounts of new snow, Since \VOSA increases the length of snowfall <br />~vents> it \ViiI result in more events causing C1valanchcs. It has been estimated <br />that controlling seeding o)J;Crations to limit twulanchcs would reduce the in- <br />crease in snowfall by as much as one-half in some areas. On the other hand, <br />the probability of flooding depends on sea<;onal accumulation ofsl1ow. The <br />seasonal accumulation must great! exceed the rmal for flood in '" - t;Y=- <br />to.)ncreasc sig.nificantly. crefore, WOSAseedio~ operations can be ~ <br />trolled to limit the robabili of flo . t1.to a Iitt.Je above normal with onJy <br />aDou a petcent loss of w~prodU~ion. <br />An avalanche hazard control program using all available methods but <br />relying principally on artHJery control is rd:ommcnded. With I his procedure, <br />avalanchc.o;; thaI. thn.:aten highways are triggered with artillery shells, or ex- <br />plosive charges. A wdl-manag~d program could reduce the hazard tt)less tilan <br />the pre.'ient level. By intx>rporating a weather and snow forecasting program <br />and a Hood hazard evaluation and prediction program into the WOSA prp- <br />gram, the losses resulting frOI).l weatberand flood effects could also be reduced <br />to less than the present level. -~. <br />