lake with 100 x 107 m2 of surface area is fed by a stream having 45 m3/s of flow with 2.3 mg/l phosphorus. phosphorus is also entering the lake through an industrial wastewater treatment plant discharges at 1.4 m3/s containing 235 mg/l phosphorus. if the lake is well mixed and the phosphorus settling rate is 13 m/yr, estimate the steady-state phosphorus concentration in the lake. what level of phosphorus removal at the treatment plant would be required to keep the average phosphorus concentration in the lake below 0.30 mg/l
