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The Arboretum Waterway, located on the University of California, Davis campus, suffers from poor water quality. The stagnation and high nutrient loading of the water body results in low dissolved oxygen concentrations and uncontrollable eutrophication. Sediment Oxygen Demand (SOD) contributes to about half of the Total Oxygen Demand (TOD) of the Waterway. In this study, sediment was collected from four separate locations along the Arboretum Waterway and tested for SOD. The sediment was collected and incubated in BOD bottles. The dissolved oxygen concentration was measured before and after incubation. The gradual increase in oxygen depletion was monitored and the SOD was calculated and graphed. The SOD in the Arboretum Waterway can be attributed to the large concentrations of organics in the sediment due to stormwater runoff and decaying debris. These organics demand large concentrations of dissolved oxygen. The Waterway is a stagnant body, which does not allow mixing, which results in low dissolved oxygen concentrations, even without the SOD.
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