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<br /> <br />Ns"eao (a.78) <br />1111..... of R.el.m.u"" <br /> <br />TECHNICAL REPORT STANDARD TITLE PAGE <br /> <br />, "[PORT ,,0 I' GQVI!:FlNN[HT ACCJ;"IOH 1010, , FlE".lpl!::..r's c..r"LOG ';0_ <br />. TillE ANO SUElHTlE , IlfpORr o..rE <br /> July 1980 <br /> The Sierra Ecology Projecl. Volume II . PEllfOIl"',,,:; OIlGANIZATlON COOE <br /> Workshops IV and V <br />, AUTHOR1Sl . f-ER.ORVING ORC;"N'ZATION <br /> Il(PORT "0_ <br /> James L. Smith. et a1. <br />. PERfOR"'ING ORGA"IZ"'TION '1....( 1.0;0 "OOIlE.SS " ,o,,JRj( u"n >;0 <br /> Pacific SouthwcsI Forest and Range Experiment <br /> Slat ion, Forest Service " CONTI'ACr OR C.'U>;T "0 <br /> I) 0 Bo.\ 245 <br /> Berkeley CA 94701 " TYP[ Q. Il[POIlT AND P[RlOO <br /> COvfREO <br />". SPONSORING AGE"CV NAVE ....0 AOORE55 <br /> Office of Almospheric Resources Management <br /> \\'aler and Power Resources Service <br /> P.O. Box 25007 " 5PO"SORI >lG "vI!: NC v COOE <br /> Denver CO 80225 <br />" SUPPI..I!:"'E'PARV NOTES <br />" "8STAACT <br /> The possible effel."ts of the SCPf' cloud seeding research program on Ihe American River Basin en. <br />vironment were analyzed at two workshops. In Worhhup IV, six scientists evaluated possible direct and <br />indirect effects of a weather modification pilot project on hydrologic processe<" induding inputs of <br />sediments and nutrients, in the American River walershed. The group proposed research and monitoring <br />recommendations and concluded that the SCPP, with a 5.10 7.5-percent precipitation increase (10 to 15 <br />percent increase reduced by 50 percent randomization), ,",,'ill not significantly alter exi<,ling nulrient and <br />particulate mailer in the watershed. Benefits at 1680 m (5500 ft) elevation may be realiled because in. <br />creased snow will enhance the snowpuck water.holding capadty. In Workshop V, scientiSh evaluated <br />possible effeels of the program on lake and stream bioI a in the ba_sin and made research and monitoring <br />recommendations. The group concludetl that streamflow temperatures at high ele\'ations may remain <br />lower during extended snowmelt due to in\;'reased winler precipitation. Nutrient conlent to streams may in. <br />crease during otherwise below-normal prcdpitation years. [.,otic warm-water fish populaliom introduced <br />in lakes may increase at the expense of nalive trout species if weather modification results in less year-to. <br />year stream and lake level nuctuations. However, fluctuations due to extemive hydroelectric power <br />generation may neutralile this effecl. Silver iodide monitoring was reviewed. <br />" "LV ""OROS "'NO OOCU"'E'H A-'ALV515 <br />,. DE SC.R IPTORS. "!~el1vironmcntal effects! .weather modification! meteorology! .environmental <br />evaluation! cloud seeding/ hydrology/ vegetation effects! sllowpacks/ sllov.melt/ seeding agents! <br />biologkal effects! climatology! soil erosion! silver iodide! sedimenTation rates! waTer quality/ biotal ben- <br />thi\; fauna! fish management/ watershed managemenl/ heavy metals! ecosystems <br />, IO(I,'T!FlfFlS.. I Sierra Ecology Project! Project Skyv.ater! Sierra Cooperative Pilot Projl.'l::l <br />(SCPP)/ Sierra Nevada! Foresl Service! American River Basin <br />, C05..\ rl r::'l'ld .c, ~f' 04B CO\~FlR tJ..W2.1 <br />". DI~H~IBUT,O,", 5T"'TE"'ENT " 5ECUJlIT...<.:I.....S5 , ..0_ OF P"'['[ <br />Avoriobl.. I.om l~'" Nat,onal Te-(:>1.H(:<I1 )"fa.mot,on Ser",ce-. Ope.alIonl It"" ~(PC.'I 118 <br /> UNCLIl,5SIr::,ED <br />OJ'Jllon. Sp"nrf..e,o:}. Vrrg,nro 12161. SEi:.URITVCL"SS a <br /> " PRtCE <br /> 1.""....Gll <br /> UNCLASSIFIED <br /> <br />GPO ....IJQ <br /> <br />