Dealing with TMDLs in the Dairy-McKay HUA

by Robert L. Hummel,
Robert App,

Document Type: Proceeding Paper

Part of: Coastal Zone '93


The maximum phosphorus concentration for the TMDL in the Tualatin River is set by Oregon Administrative Rules (OAR) at 0.07 mg/1, Dairy-McKay Creek is 0.045 mg/1 Identification of potential sources of agricultural phosphorus loading was undertaken. Confined animal feeding operations (CAFO) were identified as a major contributor. Reducing contaminated runoff from CAFO was the most immediate way to reduce agricultural loading of phosphorous. Other studies have shown phosphorus concentrations remaining high after the application of BMPs on CAFO. Spatial tracking of BMP application may be a better indicator of agricultural NPS TMDL compliance.

Subject Headings: Clean Water Act | Agriculture | Agricultural wastes | Best Management Practice | Nonpoint pollution | Concentrated loads | Hydrology | Phosphorus | Oregon | United States

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