The gravitational waterfall dc1 particles free-fall radially inward toward a central mass. Their velocity at radius r equals the free-fall velocity, producing the Painlevé-Gullstrand form of the Schwarzschild metric exactly. Mc² orbital system dc1 particles fall inward from all directions At radius r, each dc1 has fallen from infinity v_ebb = √(2GM/r) free-fall velocity Modons in this flow see an acoustic metric ds² = −(c²−v²)dt² − 2v·dr dt + dr² Painlevé-Gullstrand metric exactly Schwarzschild metric All classical GR tests pass The dc1 ebbing current IS the "gravitational waterfall" Spacetime curvature is the gradient of the flow