Simple Water Measuring Device for On Farm Irrigation Evaluationby Mohammad Yousaf, New Mexico State Univ, United States,
Z. A. Samani, New Mexico State Univ, United States,
Abstract: Laboratory experiments were conducted for the calibration of three flumes of different sizes. The logarithmic transformation in linear regression yielded excellent results for the stage-discharge relationship with coefficients of determination 0.998, 0.992, and 0.998 for 8 inches, 10 inches, and 12 inches circular flumes, respectively. The results showed that these flumes can be operated satisfactorily in flat irrigated areas, because limited head loss is required for the device to achieve critical flow conditions. The performance of flumes at non-level placement is satisfactory up to -3% slope, and up to +2% slope for higher flow only. The submergence tests showed good limits of tolerance to submergence. The average submergence limits were 90.9%, 87.7% and 86.9% for 8 inches, 10 inches, and 12 inches flume, respectively. This simple and low cost water measuring device has potential for use in managing and evaluating on-farm irrigation system.
Subject Headings: Flumes | Submerging | Calibration | Water discharge | Critical flow | Slopes | Irrigation systems
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