Problem:
If a river with a seasonal low flow of 200 cfs has a water quality standard for phosphate of .02 mg/L as P, find the TMDL for P. Diffuse agricultural runoff contributes 10 lbs of P per day.
Required:
Question: If the margin of safety is set at 4 lbs of P per day, what would be the maximum waste load allocation of P from a wastewater treatment plant discharging to the river?
Note: Explain all steps comprehensively.