A phosphorus limited lake with a surface area equals to 85x106 m2 is fed by a 20.0 m3/s stream that has phosphorus concentration of 0.010 mg/L . In addition the effluent from the point source adds1.0 g/s of phosphorous . The phosphorous settling rate is estimated at 10m/yr. 1 estimate the average total phosphorous concentration , 2 ) what rate phosphorus removal at the waste water treatment plant would be required to keep the concentration of phosphorous in the