Examples of estuaries in relation to the classification scheme shown in Fig. 12.1. The regions highlighted by concentric circles indicate the four classifications for positive estuaries of Chapter 11 (labelled W, H, S and M in Fig. 12.1). "High" and "low" indicate different discharge conditions; these conditions apply generally, in the sense that the upper end of a line corresponds to high discharge. The Mississippi, Columbia, Connecticut, James, Delaware and Raritan River are in the USA, Juan de Fuca Strait in Canada and the USA, and Silver Bay in Alaska. Based in part on Hansen and Rattray (1966).
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