Benefits of dredging through redueed tidal waiting

Tidal waiting (for random arrivals and a sinusoidal tide pattern) can be approximated by simple formulae. Such formulae may be useful for estimating the benefits of dredging programmes carried out to reduce tidal waiting. Even if no economies of size are expected, a dredging programme may still be justified by time savings as they are especially imporatant for the larger and most time-expensive vessels.