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<br />Table 15. Average percentages of instantaneous streamflow and instantaneous total-recoverable manganese load contributed to <br />the Arkansas River by the upstream main-stem site and the intervening tributaries in the same reach. Aprli 199D--March 1993 <br />[Main.stcm sites are in capital letters; d, no data] <br /> StreamflOw Total.recoverable manganese load <br />Slto nomo (In porcent) (In percent) <br />(see toblo 1) April June July- October April June July- October <br /> Augu.t August <br /> Main.stem reach I (Leadville to Malia) <br />LEADVILLE 41 70 54 30 7 36 21 40 <br />California Gulch 2 I 2 I 139 28 88 87 <br />Lake Fork above Halfmoon Creek 39 21 36 35 21 14 18 13 <br />Iowa Gulch 0 4 4 4 0 3 4 0 <br />Empire Gulch 0 2 I 0 0 2 2 0 <br /> Main-stem reach 2 (Malta 10 Granite) <br />MALTA 56 32 30 80 93 61 87 117 <br />Lake Creek below Twin Lakes Reservoir 19 59 56 12 2 /3 2/ 7 <br /> Main-Item reach 3 (Granite to BueDa Vista) <br />GRANITE 76 78 78 76 180 61 108 223 <br />Clear Creek below Clear Creek Reservoir 9 12 15 10 3 I 16 7 <br /> Main-stem reach 4 (Buena Vista to Nathrop) <br />BUENA VISTA 78 92 80 53 101 100 98 52 <br />Cottonwood Creek 2 I I 7 0 I 2 <br />Chalk Creek I 9 8 8 I 7 10 12 <br /> Main~stem reach 5 (Natbrop to WellsviUe) <br />NATHROP 99 99 96 77 133 92 76 77 <br />South Fork Arkansas River 2 3 I 5 I 2 2 6 <br /> Main-stem reach 6 (WeUsvUle to Parkdale) <br />WELLSVILLE 83 88 95 87 112 251 90 66 <br />Badger Creek 3 0 I 2 4 0 4 2 <br />Tallahassee Creek I I I I 2 3 2 2 <br /> M.ln~stem reach 7 (parkdale to Portland) <br />PARKDALE 1\ 98 122 104 67 93 92 61 <br />Fourmile Creek II 2 5 6 27 3 6 II <br /> <br />Table 16. Results of Wilcoxon rank-sum test (Hailed) of pre-treatment (April 199O-March 1992) and post-treatment <br />(April 1992-March 1993) instantaneous streamfiow and manganese concentrations at selected sites in the upper Arkansas <br />River Basin <br /> <br />(ft3/s, cubic feel per second; f.lgIL, micrograms per liter; <, less than; S, less than or equalloJ <br /> Streamllow DIssolved manganese Total..recoverable <br /> manganese <br /> Slto noma Pre-fpost. Pre-/post.. P...../po.t- <br /> (see lablo 1) treatment p-volue treatment p.va'ue treatment p-value <br /> median 1 median 1 median 1 <br /> (tt'/s) ("g/L) ("g/L) <br /> Leadville Mine Drainage Tunnel 2.312.4 0.38 . .' 1,5001205 ,. 0.01 ':.>..:.....),60.01185... . <0.01 <br /> California Gulch .... .... .. 9,5S0!:l,6S0 .' <br /> 1.8/1.8 50 lO,OOO/3;70ll .01 .02 <br /> Leadville 70/58 .50 . ..14121i'-:..' <.01 "'::.',95/40.. <.01 <br /> Malta 991134 .35 ., >110160'.. . .01 \50/140 .12 <br /> Granite 2771470 .45 38/19' . .03 60/60 .39 <br /> Buena Vista 400/462 .45 14il2 .09 40150 .47 <br /> Nathrop 563171 7 .45 Un. .05 60/30 .28 <br /> Well,ville 5241742 .38 .....,. ..'12110.':' .01 40140 .41 <br /> Parkdale 582/843 .41 6/5 .24 40140 .28 <br /> Portland 5 I 2/800 .\8 17117 .34 70/90 .08 <br /> I Significant differences (p~O.05) are shaded. <br />32 Wotar-Quollty A....sment 01 the Arkon.os River Bo.ln, Southeastorn Colorado, 1991Hl3 <br />