Water Pollution and Quality Modeling - Theory & Concepts - Oxygen Sag Curve

Understanding sources of water pollution, physical and chemical parameters, Biochemical Oxygen Demand (BOD), and the Streeter-Phelps equation for modeling dissolved oxygen in streams.

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Oxygen Sag Curve (Streeter-Phelps)

Initial BOD ($L_0$): 20 mg/L

Initial DO Deficit ($D_0$): 2 mg/L

Deoxygenation Rate ($k_d$): 0.2 /day

Reaeration Rate ($k_r$): 0.4 /day

Blue Line: Dissolved Oxygen (DO) concentration.
Sag Point: The lowest DO level, occurring when Deoxygenation Rate = Reaeration Rate.
Critical Deficit ($D_c$): Maximum difference between Saturation DO and Actual DO.

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