Hydraulical Approach in Designing of Proportional Division Structures in Traditional Irrigation Schemes
Abstract: To disribute water
in equal and adequate ways among the farmers, farmers have been using a
proportional division structure for years. The constrtuction of the structure
is made of wood or stone with the notchs in rectangular form in part of its
upper side. Its performance criterion estabilished by pertinient famers i.e. the
notch width has to be proportional to the size of its command area. From
hydraulic point of view, however, the unreliability of these structures can be
occurred and it was estimated that their performance criteria not only depend
on the notch width but also the other hydraulic design criteria. The objectives
of this research are: (i) to comprehend the dependence of performance of a
proportional division structure on hydraulic design criteria, (ii) to know
relationships between the discharge of structure and the hydraulic design
criteria. Result of experiment indicated that the performance of a proportional
division structure not only depend on notch width but also the other hydraulic
design criteria in common. In general, there were the relationships between
discharge of a notch and the hydraulic design criteria including notch width, thickness
and surface roughness of the structure, and deviation angle of channel where
the structure to be located.
Keywords: traditional
Irrigation system, proportional devision structure, physical model, dimension analysis
Author: M. Hasan Yahya
Kode Jurnal: jppertaniandd090115
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