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if for a 90 degree triangular weir a head of 615mm is measured, what length of cipolleti weir could be substituted so that the length of weir would be four times the head on it?

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Answer:

90° Triangular Notch Weirs

This calculates the flow rate over a 90° triangular notch weir. The opening to this weir is a 90 degree triangular notch. The bottom of the notch is the lowest point with the sides going up at 45 degree angles. The water before the weir should be held in a relatively calm and smooth pool. There should be air underneath the water leaving the weir. The height is determined by measuring the ponded water elevation above the bottom of the weir.

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