\large
$$
P = \rho gh_l 
$$
$$
A_{baffle}  = L_s *w
$$
$$
F = PA_{baffle} 
$$
$$
F_{pipe}  = {F \over {N_{pipes} }}
$$
$$
F_{pipe}  = {{\rho *g*h_l *L_s *w} \over {N_{pipes} }}
$$