Purpose: to show an example of hydraulic computation of a hydrometric structure (triangular asymmetric profile threshold weir, Crump weir) with the possibility of equipping it with an automatic level recorder.
Materials and methods. The indirect “velocity – area” method for determining water flow in an open flow using hydrometric structures is known. The functional dependencies of the measured parameter on water flow changes for a hydrometric structure – a triangular asymmetric profile threshold weir, obtained as a result of well-known experimental studies are used in calculations.
Results. For hydraulic calculations, data of a rectangular discharge canal: width B = 4 m, height hстр = 2 m, maximum flow Qmax = 10 cub. m/s and minimum flow Qmin = 4 cub. m/s were used. The weir width (b = 3.2 m) was selected. Using the working flow equation for the Crump weir, the maximum (hmax = 1.20 m) and minimum (hmin = 0.65 m) pressures on the threshold crest and the threshold height (P = 0.63 m) were determined, and the necessary regulatory conditions for free water discharge through the calculated threshold and the condition for fulfilling the Froude number were checked.
Conclusions. The main approach to equipping a water metering station with a modern measuring device is discussed. The performed hydraulic computation for a triangular profile threshold weir determines the necessary parameters for the weir width and the threshold crest height for a rectangular canal with known parameters (width and height) used for waste water discharge. The calculated range of water levels above the weir threshold crest is used in choosing the type of hydrostatic pressure sensor, constituting its technical characteristics. Equipping a triangular asymmetrical profile threshold weir with a modern metering device, consisting of an immersed hydrostatic pressure sensor and a remote control unit, will provide prompt and reliable information on the discharged water flows in the canal.
reclamation system, water metering station, hydrometric structure, hydraulic computation, automatic level recorder
Yuchenko L. V., Filimonova V. M., Chernova O. N. Improving water metering with a triangular asymmetrical profile threshold weir on a reclamation canal. Ways of Increasing the Efficiency of Irrigated Agriculture. 2024;93(2):116–128. (In Russ.)
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