Consider the University lake system in Baton Rouge, Louisiana, which has a potential water quality problem resulting from waste discharged into the nearby Crest Lake. From the following data determine what nutrient level (phosphorus) is to be expected at steady state in the Crest Lake, which is a completely mixed unstratified system.
Assume no losses due to volatilization or other reactions of P in the lake. What reduction in discharge level should be accomplished so that the P concentration is reduced to