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<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:contributor>Charles G. Crawford</dc:contributor>
  <dc:contributor>James G. Peters</dc:contributor>
  <dc:contributor>Frank P. Girardi</dc:contributor>
  <dc:creator>William G. Wilber</dc:creator>
  <dc:date>1979</dc:date>
  <dc:description>&lt;p&gt;The Indiana State Board of Health is developing a State water-quality management plan that includes establishing limits for wastewater effluents discharged into Indiana streams. A digital model calibrated to conditions in Clear Creek was used to develop alternatives for future waste loadings that would be compatible with Indiana stream water-quality standards defined for two critical hydrologic conditions, summer and winter low flows.&lt;/p&gt;&lt;p&gt;The Winston Thomas wastewater-treatment facility is the only point-source waste load affecting the modeled segment of Clear Creek. A new wastewater-treatment facility under construction at Dillman Road (river mile 23.78) will replace the Winston Thomas wastewater-treatment facility (river mile 16.96) in 1980.&lt;/p&gt;&lt;p&gt;Natural streamflow during the summer and annual 7-day, 10-year low flows are zero, so no benefit from dilution is provided.&lt;/p&gt;&lt;p&gt;The model indicates that ammonia-nitrogen toxicity is the most significant factor affecting the stream water quality during summer and winter low flows. The ammonia-nitrogen concentration of the wastewater effluent exceeds the maximum total ammonia-nitrogen concentrations of 2.5 milligrams per liter for summer months (June through August) and 4.0 milligrams per liter for winter months (November through March) required for Indiana streams.&lt;/p&gt;&lt;p&gt;Nitrification, benthic-oxygen demand, and algal respiration were the most significant factors affecting the dissolved-oxygen concentration in Clear Creek during the model calibration. Nitrification should not significantly affect the dissolved-oxygen concentration in Clear Creek during summer low flows when the ammonia-nitrogen toxicity standards are met.&lt;/p&gt;&lt;p&gt;Carbonaceous biochemical-oxygen demand is probably not a significant factor in the dissolved-oxygen dynamics of Clear Creek because most of the carbonaceous biochemical-oxygen demand was estimated to be removed through settling or some other process.&lt;/p&gt;&lt;p&gt;The 5-day biochemical-oxygen demand of the effluent from the new wastewater-treatment facility at Dillman Road will be limited to 5 milligrams per liter after the implementation of advanced-waste treatment in 1980.&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.3133/ofr791533</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>U.S. Geological Survey</dc:publisher>
  <dc:title>A one-dimensional, steady-state, dissolved-oxygen model and waste-load assimilation study for Clear Creek, Monroe County, Indiana</dc:title>
  <dc:type>reports</dc:type>
</oai_dc:dc>