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<br />nO??70 <br /> <br /> 500.000 <br />'" .. <br />Z MEASURED VALUES <br />0 T Site 4 4< <br />f-- . <br />;;; . Site 5 <br /> ... Site 6 .. <br />--' 400,000 , <br />ro ESTIMATED VALUES <br />" o Site 5 <br />"0 . <br />"" l:J. Site 6 6t> <br />0 <br /><( tJ. <br />0 300,000 o~ <br />-' <br />'" 6 . 0 <br />0 .., <br />:J 6 0 <br />0 .. <br />'" 0 <br />6 200,000 6 .." <br />w <br />> 0 .. <br />-' <br />0 .. <br />'" <br />'" .. <br />15 <br />-' 100.000 <br /><( <br />::) <br />Z <br />Z <br /><( <br /> 0 <br /> 0 200,000 400,000 600,000 800,000 1,000,000 <br /> ANNUAL STREAM DISCHARGE (Oal, IN ACRE-FEET <br /> <br />Figure 23, Correlation of estimated (water years 1975-82) and measured (water years 1983-88) annual <br />dissolved-solids loads at sile 5 and 6 and measured annual dissolved-solids loads at site 4 (water years <br />1975-88) with annual stream discharge. <br /> <br />A comparison of the annual suspended-sediment <br />loads (table 5) and annual dissolved-solids loads <br />(table 10) indicate that total solids (suspended sediment <br />plus dissolved solids) transported in the White River <br />were mostly as dissolved solids upstream from site 4 <br />and mostly as suspended sediment downstream from <br />site 4. Annual total-solids loads at sites 1-6 ranged from <br />about 23,200 tons at site 2 (water year 1977) to about <br />2.4 million tons at site 6 (water year 1984). The esti- <br />mated average annual total-solids load at site 6 for water <br />years 1975-88 was about 1.1 million tons. <br /> <br />Nutrients <br /> <br />A total of 51 water samples were collected peri- <br />odically at sites 1-6 during water years 1987-88 and <br />were analyzed for dissolved concentrations of nitrogen <br />and phosphorus. The samples were collected in down- <br />stream order to define changes in nutrient concentra- <br />tions as water moved downstream. Dissolved <br /> <br />concentrations of ammonia as nitrogen (hereinafter <br />referred to as ammonia), nitrite plus nitrate as nitrogen <br />(hereinafter referred to as nitrite plus nitrate), organic <br />nitrogen, and phosphorus for water years 1987-88 at <br />sites 1-6 are shown as grouped data for each site in fig- <br />ores 25 and 26. Analyses of data for water years 1987- <br />88 and a review of oIher nutrient data collected period- <br />ically during water years 1975-86 indicate Ihat changes <br />in nutrient concentrations correlated poorly with <br />changes in stream discharge. <br /> <br />Concentrations of ammonia in the White River <br />(fig. 25) ranged from less Ihan 0.01 to 0.11 mgIL, and <br />concentrations were less Ihan or equal to 0.05 mgIL in <br />46 of 51 samples. Concentrations of nitrite plus nitrate <br />in Ihe White River ranged from less Ihan 0.1 mgIL at all <br />sites to 0.53 mgIL at site 6. Concentrations were least <br />at site 1 (all values less Ihan 0.1 mgIL) and generally <br />were small at sites 2-4 (all values were less Ihan <br />0.18 mgIL). Concentrations of nitrite plus nitrate gen- <br />erally increased downstream and exceeded 0.20 mgIL in <br />12 of 22 samples at sites 5 and 6. <br /> <br />WATER-QUALlTY CHARACTERISTICS AND LOADS 47 <br /> <br />.1_ <br />