Use Of Floodgates As Flow Measure
Structures In Irrigation Canals
Author(s)
B. de León Mojarro, B. R. Rubio, L. R. Pimente
& V. Prado Hernández
Abstract
The structures in the irrigation districts to control the flows and water levels, as
well as water measuring, are fundamental to bring order to the distributing canals
operation and the volumetric delivery to the irrigated areas. Water delivery is
carried out at control points supervised by the districts, the limited responsibility
societies, the irrigation modules and the users at a parcel level. At this point,
measuring structures are of different types according to the topography and
hydraulic, geometrical and operative characteristics in places where the
structures are located. They can be windmills, velocity sensors of different types
like fixed and portable, weir and floodgate type holes. The flows and levels in
the canals are normally controlled through floodgates and weirs; although the
structures use is not for measuring, an experimental relationship must be
established to determine the flow from the water levels and gap. Flat, vertical
and radial floodgates have been used as control and flow structures in the main
canals of the watering districts in Mexico. Due to the importance of these
structures in the canals operation, an analysis was carried out on the precision
and trust of the water measuring with floodgates functioning at free discharge
and drowned. As from the simplified equations for Saint-Venant transitory flux
at the structures vicinity, functional relationships were established between the
up-stream waters level, down-stream and gap, and were proven in different
precision and confidence ranks to estimate the flow. The validness of these
relationships was analyzed through experimental data of calibrated floodgates in
the Enzo Levi laboratories at the Mexican Institute of Water Technology and the
Irrigation Department at the Autonomous University of Chapingo. The existing
differences between the experimental flows and the ones estimated through the
structure calibration model confirm that the floodgates can help as flow
structures as long as the functional relationships established are verified.
Keywords: irrigation canals, water measurement, control gate.
Keywords
irrigation canals, water measurement, control gate.
Related Book
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