Two problems about
surfaces, both involving a gravitational forcing term, are studied from an
evolutionary perspective. It is shown that, in each case, the existence of a unique
solution to the associated Boundary Value Problem (BVP) may be established using
a suitable mean curvature type flow. By considering two different flows for one
of the problems it is illustrated that the best choice of flow, for use in the
evolutionary construction of solutions to such mean curvature type BVPs,
may often be determined more by geometric considerations than by analytic
ones.