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Weirs and orifices are the standard field tools for measuring water flow in irrigation systems. Select the calculator that matches your structure:
Measure flow over a diversion dam crest, check structure, or weir board. Enter weir length and headwater depth above the crest.
Weir Flow SimpleUse when the weir crest varies in elevation or profile — natural spillways, drop structures with varying width, or multi-section control structures.
Weir Flow IrregularMeasure flow through a sluice gate, pipe turnout, or culvert opening. Handles both free outfall and submerged (tailwater) conditions automatically.
Orifice FlowDesign or check an irrigation canal using Manning's formula. Use the Trapezoidal calculator for new channels; the Irregular calculator for existing natural or constructed sections.
Manning Trapezoidal Channel Manning Irregular ChannelEstimate seepage loss from a canal reach using inflow and outflow measurements. Compute conveyance efficiency and annual water loss to help prioritize lining investments.
Canal SeepageModel the pressure and flow profile along a main-lateral-emitter branch to estimate distribution uniformity from the real test-path pressure, not just a catalog emitter flow rate.
Irrigation PressurePlease share your valued words of suggestion or praise. Did this free calculator exceed your expectations in every way? [Hide this line]