VNotch will calculate flow rates from Vnotch weirs, it works with Metric, U.S. Customary Units, Imperial Units.

Vnotch is a simple app to calculate the flow rate at a V Notch Weir, it works in U.S. Customary Units, Imperial Units and Metric Units. For use on fully contracted V Notch weirs. The app is simple to use, select the appropriate unit set, confirm the notch angle and enter the height of the head at the V Notch.

App Privacy

The developer, James Nicolson, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer's privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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