The analysis and prediction of tidal currents from observations of times of slack water

Abstract
For the purposes of navigation tidal currents may be more important than the rise and fall of the surface, and in fact navigation may be impossible except near times of slack water. In British waters the currents have fairly close connection as regards time and speed with the surface movements, though in some straits in Canadian waters the currents may be largely diurnal in character, whereas the rise and fall of the surface may be semidiurnal in general character. Therefore, the currents cannot be satisfactorily inferred from the tables of high and low water times and heights, and this is probably true in general. The measurement of tidal currents is not easily effected, but if hourly values are available then the ordinary methods of tidal analysis can be used, though such is rarely the case. The usual method of observation is to determine the time of slack water if the currents are constant in direction.

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