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Errors in Measurement of Irrigation Water
Devices and structures for measuring irrigation water are subjected to changes in water levels upstream and downstream from the point of measurement. The generally accepted approach to meet this problem is standardization and calibration of the measuring equipment. The use of tables, graphs, or charts developed (from the calibrations) for determining discharge in the field is based on the criteria that the field structure is a replica of the device from which the data were derived and that the flow conditions are identical. Deviations from these standards will result in errors. The magnitude of errors resulting from changes in certain dimensions, incorrect settings, changes in flow patterns, and other deviations is evaluated for some of the commonly used measuring devices. Measurements obtained from equipment capable of operating with a high degree of accuracy may be subjected to errors unless care is exercised in fabrication, installation, operation, and maintenance.
Errors in Measurement of Irrigation Water
Devices and structures for measuring irrigation water are subjected to changes in water levels upstream and downstream from the point of measurement. The generally accepted approach to meet this problem is standardization and calibration of the measuring equipment. The use of tables, graphs, or charts developed (from the calibrations) for determining discharge in the field is based on the criteria that the field structure is a replica of the device from which the data were derived and that the flow conditions are identical. Deviations from these standards will result in errors. The magnitude of errors resulting from changes in certain dimensions, incorrect settings, changes in flow patterns, and other deviations is evaluated for some of the commonly used measuring devices. Measurements obtained from equipment capable of operating with a high degree of accuracy may be subjected to errors unless care is exercised in fabrication, installation, operation, and maintenance.
Errors in Measurement of Irrigation Water
Thomas, Charles W. (author)
Transactions of the American Society of Civil Engineers ; 124 ; 319-332
2021-01-01
141959-01-01 pages
Article (Journal)
Electronic Resource
Unknown
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