Problem
DO sag calculations. A wastewater is discharged into a river at 555 L/s. The river's volumetric flow rate just upstream from the wastewater discharge is 5,550 L/s. DO in the waste and river (upstream) are, respectively, 2.5 and 7.5 mg/L. BODu in the waste and river (upstream) are, respectively, 62.5 and 6.2 mg/L. Temperatures are 20C. Calculate the volumetric flow rate, DO, and BODu at the point where the waste and river meet and are completely mixed. Units should be L/s and mg/L.