Design a rectangular clarifier for an average wastewater flow of 7570m3/d with a peak hourly flow of 19,000m3/d and a minimum flow of 4500m3/d for an estimated 35 percent BOD5 removal at the design average flow. Assume the depth of the clarifier is 3.0m, length to width ratio is 4:1 and the maximum weir loading for average daily flow is 124m3/d.m. Assume the use of two settling tanks with the aforementioned dimensions. (40 marks) (i) Calculate the total surface area of the clarifiers; (ii) Determine the length, width, and volume of the clarifiers; (iii) Compute the detention time at average and peak flow rates; (iv) What is the overflow rate at peak flow? (v) Calculate the length of the outlet weir; (vi) What is the expected TSS and BOD removal efficiencies at peak and minimum flow conditions