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E. Noether's general analysis of conservation laws has to be completed in aLagrangian theory with local gauge invariance. Bulk charges are replaced byfluxes of superpotentials. Gauge invariant bulk charges may subsist whendistinguished one-dimensional subgroups are present. As a first illustration wepropose a new {\it Affine action} that reduces to General Relativity upon gaugefixing the dilatation (Weyl 1918 like) part of the connection and eliminationof auxiliary fields. It allows a comparison of most gravity superpotentials andwe discuss their selection by the choice of boundary conditions. A second andindependent application is a geometrical reinterpretation of the convection ofvorticity in barotropic nonviscous fluids. We identify the one-dimensionalsubgroups responsible for the bulk charges and thus propose an impulsiveforcing for creating or destroying selectively helicity. This is an example ofa new and general Forcing Rule.Comment: 64 pages, LaTeX. Version 2 has two more references and one misprint  corrected. Accepted in Classical and Quantum Gravit

Currents and superpotentials in classical gauge-invariant theories: I. Local results with applications to perfect fluids and general relativity