Monitoring and Evaluation of Hydraulic Off-Takes Sensitivity in Left Main Canal Scheme in Chiang Rai Province
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Abstract
The study aims to monitoring and evaluation the sensitivity of water flow variation through hydraulic off-take in the Left Main Canal scheme (LMC scheme) dominated on the Mae Lao irrigation scheme (MLIS), Chiang Rai province. Because water scarcity is always a serious problem in the dry season due to over cultivated area, checking irrigation water supply along the main canal level is necessary to monitor equity of water distribution. Selected hydraulic off-takes structures are measured by the off-take sensitivity value. Results found that initial canal section is low sensitivity values (less than 1), while the middle and end of the LMC sections are high sensitivity values (greater than 2). According to the result, hydraulic off-takes management of study area is suggested that the low off-take sensitivity values covers the initial canal sector should only require intermittent gate adjustments, the medium off-take sensitivity values includes some parts of the initial canal section should require average adjustment and frequency maintenance program and the high sensitivity, including almost all structures located from the middle to the end of the canal section, should require frequent adjustments, calibrations, and maintenance program before dry season.
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