The work studies boundary value problems with non-dynamic and dynamic boundary conditions for one- and two-dimensional Boussinesq-type equations in domains representing a trapezoid, triangle, “curvilinear” trapezoid, “curvilinear” triangle, truncated cone, cone, truncated “curvilinear” cone, and “curvilinear” cone. Combining the methods of the theory of monotone operators and a priori estimates in Sobolev classes, we have established theorems on the unique weak solvability of the boundary value problems under study.