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<br />, '~?n <br />0020....;] <br /> <br />BIBLIOGRAPHIC DATA <br />SHEET <br />4. Tide and Subtitle <br /> <br />1. Report No. <br /> <br />3. Recipient's Accession No. <br /> <br />2. <br /> <br />5. Report Date <br />March 1978 <br /> <br />Analysis of Waste-Load Assimilative <br />River, Steamboat Springs to Hayden, <br /> <br />Capacity of the Yampa <br />Routt County, Colorado 6. <br /> <br />7. Aurhor(s) <br />Daniel P. Bauer Timoth D. Steele <br />9. Performing Organization Name and Address <br />U.S. Geological Survey, Water Resources Division <br />Box 25046, Mail Stop 415 <br />Denver Federal Center <br /> <br />8. Performing Organization Repr. <br />No. <br /> <br />and Richard D. Anderso <br /> <br />USGS WRI-77-119 <br />10. Project/Task/Work Unit No. <br /> <br />11. Contract/Grant No. <br /> <br />i <br />.' <br /> <br />12. Sponsoring Organization Name and Address <br />U.S. Geological Survey, Water Resources Division <br />Box 25046, Mail Stop 415 <br />Denver Federal Center <br /> <br />13. Type of Report & Period <br />Covered <br /> <br />14. <br /> <br /> <br />15. Supplementary Notes <br /> <br />Prepared in cooperation with the Routt County Department of Environmental Health <br />16. Abstracts <br /> <br /> <br />An analysis of the waste-load assimilative capacity of the Yampa River <br />from S~eamboat Springs to Hayden, Colo., was made to obtain information on the effects <br />of projected waste loadings on this stream reach. Simulations of effects of waste, <br />loadings on streamflow quality were made using a steady-state water-quality model. <br />The simulations were based on 7-day low-flow values with a lO-year recurrence interval <br />and population projections for 2010. Model results for December, and September stream- <br />flow conditions indicated that a recommended water-quality standard of 0.02 milligram <br />per liter for nonionized ammonia concentration would be exceeded. Model simulations <br />also included the effect of a flow augmentation of 20 cubic feet per second (0.56 cubic <br />meter per second) from a proposed upstream reservoir. The permissible ammonia loading <br />in the study reach could be increased approximately 25 percent with. this amount of flow <br />augmentation. Simulations of concentrations of other water-quality variables indicated <br />that water-quality goals proposed for 1978, 1983, or 1985 would not be exceeded. <br />17. Key Words and Document Analysis. . 17a. Descriptors <br /> <br />Colorado, Computer models, Data collection, Invertebrates, Low-flow augmentation, <br />Model studies, Nutrients, Simulation analysis, Standards, Waste assimilative capacity, <br />Water pollution control, Water Quality Act, Water storage, Water treatment <br /> <br />17b. Identifiers/Open-Ended Terms <br /> <br />Benthic-invertebrate diversity, Cold-water fishery, Computational algorithms, <br />Nonionized ammonia, Population projection, ~easonal conditions, Steady-state <br />water-quality model, Steamboat Springs, Colo., Yampa River basin (Colorado-Wyoming) <br /> <br />17c. COSATI Field/Group <br /> <br />18. Availability Statement <br /> <br />19. Security Class (This <br />Report) <br /> <br />21. No. of Pages <br /> <br />No restriction on distribution. <br /> <br />2 . Security Class (This <br />PaBe <br />UNCLASSIFIED <br />THIS FORM MAYBE REP RODUCED <br /> <br />22. Price <br /> <br />USCOMM.OC 82&S.P74 <br /> <br />FORM NTI$.all IREV. 10-731 ENOORSED BY ANSI AND UNESCO. <br /> <br /> <br />" <br />