Weir Open Channel Flow Calc

Need to measure open-channel flow at a weir and get results in CFS, GPM, or MGD without hauling out reference tables? Select V-Notch, Rectangular (Francis), or Cipolletti weir type, enter the head measurement, and get instant flow calculations in five unit systems. Supports V-Notch (adjustable notch angle: 22.5, 30, 45, 60, 90, 120 degrees), Rectangular with end contractions (Francis formula), and Cipolletti trapezoidal weirs. FLOW OUTPUT UNITS: - CFS (cubic feet per second) - GPM (gallons per minute) - MGD (million gallons per day) - m3/s (cubic meters per second) - L/s (liters per second) KEY FEATURES: - Three weir types in one app - Adjustable notch angle for V-Notch weirs - End contraction settings for rectangular weirs - Instant results as you type - Works completely offline - No account or login required Essential for hydrology field work, stormwater monitoring, irrigation measurement, and water resources engineering.