1. In the notes in Lecture 2, on Slide 6, the case of a waste flow entering a stream is considered with nofluid accumulation and no reaction (r = 0, at least over the time scale of the mixing zone). Theconstituent of concern is organic material containing phosphorus (P), which is a algal nutrient.The details for case we will consider here is

The concentrations are in mg P/L. The flow in the stream varies with season....lowest in the summer, highest with spring rains. Prepare a plot of stream concentration after mixing (cm) (y-axis) as a function of the pre-mixing zone stream flow (x-axis), which varies from 3 to 20 m³/s. Include in your plot a horizontal line at the regulatory limit of 100 mg/L.