A primary clarifier for a municipal wastewater treatment plant is to be designed for an average flow of 7570 m3/d. the regulatory agency criteria for primary clarifiers are as follows: peak overflow rate = 89.6 m3/m2.d, average overflow rate = 36.7 m3/m2d, minimum side water depth = 3 m, and peak weir loading rate = 389 m3/m.d. The ratio of peak flow to average flow = 2.75. Determine: Diameter of the sedimentation basin The length of the peripheral weir. Assume that the weir launder has a width of 50 cm (from the tank side), and the weirs are installed on one side of the launder.

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Storm Sewers and Detention

The storm drains system transports rainwater or stormwater and other runoff from roads, parking lots, and roof downpipes directly to nearby creeks, rivers, or the sea without any treatment.