Correct option is A
A typical long rectangular tank has a length ranging from 4 times their width. The bottom is slightly sloped to facilitate sludge scraping.
The general dimension of a sedimentation tank are as follows:
Length = 4 × Width
Height = 3.5 m to 5 m
Slide depth = 0.8 m to 1.2 m
Freeboard = 0.5 m
