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A one-dimensional, steady-state, dissolved-oxygen model and waste-load assimilation study for South Fork, Wildcat Creek, Clinton County, Indiana

Open-File Report 79-1074

By:
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Abstract

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 South Fork Wildcat Creek was used to predict 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. Natural streamflow during the 7-day, 10-year low flow is zero, so no benefit from dilution is provided. The Indiana State Board of Health 's projected ammonia-nitrogen concentration for the Frankfort wastewater-treatment facility will violate the instream total ammonia-nitrogen standard of 2.5 mg/l and 4.0 mg/l during summer and winter low flows, respectively. The model indicates that nitrification and algal respiration were significant factors affecting the dissolved-oxygen dynamics of South Fork Wildcat Creek during two water-quality surveys. Stream water quality during the two water-quality surveys was degraded by the discharge of wastewater receiving only primary treatment. Benthic deposits resulting from this wastewater discharge seem to exert a considerable oxygen demand. The discharge of partially treated wastewater should be eliminated when a new wastewater-treatment facility becomes operational in mid-1979. Therefore, benthic-oxygen demand due to benthic deposits should become negligible at that time. (Kosco-USGS)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
A one-dimensional, steady-state, dissolved-oxygen model and waste-load assimilation study for South Fork, Wildcat Creek, Clinton County, Indiana
Series title:
Open-File Report
Series number:
79-1074
Edition:
-
Year Published:
1979
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Description:
vii, 72 p. :ill., map ;28 cm.