...
The proposed sedimentation tank will be oriented perpendicular to the axis of the flocculator. Additionally, to accommodate the new design, water will exit the flocculator from the top, instead of the bottom. In order to eliminate differences in lengths of flow paths through the sedimentation tank, water exiting the flocculator will be split into several tubes of equal diameters and lengths, which will enter the bottom of the sedimentation tank. The tubes entering the sedimentation tank will be evenly spaced.
...
This design also allows us to consider the incorporation of a drain for built up sediments in the sedimentation tank, adding the functionality to clean the sedimentation tank while the plant is still running.
The MathCAD design and AutoCAD drawings of the proposed sedimentation tank have been uploaded.