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DROP - In bassin' terminology, a 'drop' is any rapid contour change of the bottom resulting in deeper water. LEDGE - A 'ledge' is defined as the upper lip of a drop. (It is possible to have a series of drops and ledges, like stair steps progressing down towards the deeper water.) FISHING LURE - A carefully selected fishing 'tool' which is chosen by first considering depth and speed requirements, in that order.
The weir crest is the top of the weir. For a v notch weir it is the point of the notch, which is the lowest point of the weir opening. The term nappe is used for the sheet of water flowing over the weir. The equations to meter flow in this article require free flow, which takes place when there is air under the nappe.