The V-Notch Flow Calculator, a tool to instantly calculate water flow rates (Q) from standard 90° V-notch weir head readings. Built specifically for hydrogeologists, contractors, and site engineers, this calculator streamlines data collection during tubewell drilling and pumping tests. This tool helps in conversion into flow rates in m³/h, MLD, and gallons per hour.
How to Measure V-Notch Head (H)
Note: The zero mark (0 cm) on the measuring stick must align exactly with the lowest point (vertex) of the 90° V-notch. The head (H) is read at the water surface level.