The nature of the surface non-tidal circulation in the sea in the approaches to Juan de Fuca strait, latitude 48°30′N., longitude 125°00′W., is interpreted from stream line diagrams, four of which are reproduced. It is shown that the system represents a balance between a wake stream flow from Juan de Fuca strait, which is directly related to the volume of land drainage, and the independent wind-driven currents, which are due to one of the two prevailing coastwise winds in the area.
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John P. Tully (1941) studied this question.