Impingement of a water jet on a rigid wall and entry of a rigid body into water are subject to common effects of compressibility, occurring during a very short period. Thanks to order of magnitude estimates and application of the fundamental laws of conservation, the extent and the duration of the domain of highly compressed water are obtained in terms of the Mach number and of the curvature at the tip of the jet, or of the projectile. The model works for jet fronts and body profiles of any shape.

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