International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage



(3709) Marseilles canal type outlet
A module used on the Marseilles canal in France. It is housed in a small locked room. At the bottom of a masonry system connected with the canal there is a circular orifice, into which is accurately fitted, by a water tight collar, an iron cylinder open at each end. This cylinder hangs to a wooden bar supported by two floats on the surface of the water, and slides freely up and down in its collar. By means of a screw the distance of the upper edge of the cylinder from the bar, and consequently from the water surface, is fixed and that being done so as to give the required discharge; it is never altered. From the bottom of the cylinder the water goes straight into the watercourse (illustrated).

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