User:Yumhotpot/Streeter–Phelps equation

The following figure shows a visualization applying the Streeter Phelps equation to model the biological oxygen demand (BOD) in a shallow channel that is mixed vertically. For simplicity sake, the magnitude of the depth is assumed to be much lower compared to the width and advection in the y-direction is arbitrary. This allows the model to focus on modeling the BOD only in the x-direction. BOD is a common water quality of interest that describes the amount of oxygen consumed by the microorganisms present in the water. Aquatic ecosystems need a certain level of oxygen in order to sustain life, therefore this modeling is useful for determining regulations on effluent water quality.