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Rectangular Horizontal Flow Tank - Rectangular horizontal flow sedimentation tanks are normally built of bricks or concrete and are rectangular in plan and cross section. The inlet for the raw water and the outlet for clarified water are made at opposite ends of the tanks near the top surface.

Turbulence or cross circulation of the influent water within the tank will reduce the efficiency of the sedimentation process. This can be over come by setting a special inlet structure which ensures an even distribution of the influent water over the full width and depth of the tank similarly the outlet structure ensures the even collection of clarified water.