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The role of "Fermi arc" surface-quasiparticle states in "topological metals"(where some Fermi surface sheets have non-zero Chern number) is examined. Theyact as "Fermi-level plumbing" conduits that transfer quasiparticles amonggroups of apparently-disconnected Fermi sheets with non-zero Chern numbers tomaintain equality of their chemical potentials, which is required by gaugeinvariance. Fermi arcs have a chiral tangential attachment to the surfaceprojections of sheets of the bulk Fermi Surface: the total Chern number of eachprojection equals the net chirality of arc-attachments to it. Information fromthe Fermi arcs is needed to unambiguously determine the quantized part of theanomalous Hall effect that is not determined at the bulk Fermi surface.

Attachment of Surface "Fermi Arcs" to the Bulk Fermi Surface: "Fermi-Level Plumbing" in Topological Metals