Energy flow and stopping in relativistic heavy-ion collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="italic">E</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="normal">lab</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>/<i>A</i>=14.6 GeV

Collisions of $^{28}\mathrm{Si}$+Al, Cu, Pb at ${\mathit{E}}_{\mathrm{lab}}$/A=14.6 GeV were studied in a calorimetry-based experiment at the BNL Alternating Gradient Synchrotron. Transverse-energy production was measured for pseudorapidities -0.50.8. Correlations with the spectra and multiplicity of neutrons and protons emitted into a forward 0.8\ifmmode^\circ\else\textdegree\fi{} cone demonstrate quantitatively the large amount of nuclear stopping observed in these reactions. Calculations in hadronic-fireball or nucleon-nucleon based models underpredict the measured transverse-energy production for Si+Pb and indicate the need to include rescattering of secondaries and /or contributions from target fragmentation.