On account of reliability and absence of external power source, based
channel-type flocculating devices are preferred for class-II settling.
In the present practice a feasible design is obtained by trial and er
ror to satisfy the design constraints, There is no consideration of ec
onomy in such a design, In this paper, the design of flocculating baff
led channel has been formulated as a geometric programming problem wit
h zero degree of difficulty. The solution of such a problem yields the
optimal design expressed as the closed form equations for the optimal
cost and the corresponding cost dimensions.