Author(s): S. Louis; N. Gonomy; N. de Ville; M. A. Verbanck
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Abstract: In the Northern part of the Republic of Haiti, water is extracted from the Artibonite River to irrigate 300 km 2 of a wide agricultural plain constituted primarily of paddy fields. The river comes from the Peligre reservoir where it is impounded (altitude 150 m, close to the border with Dominican Republic) to reach the Canneau irrigation dam (altitude 32 m) barring its course 70 km further downstream. Due to the variable Peligre releases and the rains which can solicit hydrologically the tributary catchments located between the two dams, the river level at Canneau is rarely keeping stable. The purpose of the Canneau dam is to facilitate the operation of two main irrigation channels, one which runs parallel to the river on the left side and a second one on the right side. The Left-side Master Canal (CMRG in its French denomination) is at the center of our analysis and investigative efforts. The water intake at Canneau is controlled by the opening of a cable-hoisted radial gate (vanne-segment) fitted with counterweight. The nominal design discharge sent to the CMRG is intended to be40 m 3 /s. A first objective of the local experimental work is to calibrate the flow rate at the gate with the adequate combination of valve opening heights (creating either free or submerged orifice conditions) and the explicit account of temporal changes in the headwater tail. A second objective is to develop a 1D velocity model valid for the first two kilometers of the trapezoidal earth-lined CMRG canal. It is shown that there is a specific stream power range in the CMRG for which the alluvial resistance is nicely described by the integer value of control factor m=3 (Verbanck 2008).
Year: 2016