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8933. Economic cut : For practical purposes there exists within a one-bank canal section a point on the ground surface that, if the excavation is to balance the embankment, will have the same cut and will be at the same distance from the canal centre line for all ground surface slopes, so long as they are uniform. In other words, for the balanced conditions, all cross-slope lines pass through this point. The cut at this point is called the `economic cut` (illustrated), the point is called the `pivot point`, and the distance from it to the centre line is called the `offset distance` (illustrated).

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8933. Saignée économique : A des fins pratiques, dans une section de canal à un cavalier, il existe un point à la surface du sol qui, lorsque le déblai doit compenser le remblai, aura la même saignée et le même éloignement de l`axe du canal pour toutes les pentes de la surface du sol pourvu qu`elles soient uniformes. En d`autres termes, pour des conditions compensées, toutes les lignes de pente passent par ce point. La saignée en ce point est appelée ` saignée économique ` le point est appelé ` point de pivotement ` et sa distance à l`axe du canal est appelée ` décalage ` (voir figure).
VOIR:

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