Abstract
A weak formulation of the equation for the elevation field arising from the shallow-water equations for a rotating inviscid fluid has been developed.
The difficulties of this problem, which are due chiefly to the fact that the normal velocity along the contour is given by a linear combination of normal and tangential derivatives of the elevation field, are overcome. As a result, many problems, until now treated using the elevation and velocity component variables, might be solved dealing only with the elevation.
