Quick, accurate flow rate calculations, right in your pocket.

FlowCalc makes open channel flow measurement fast and easy. Whether you’re in the field or the office, you can select your weir, flume, or channel shape, enter size and head/velocity, and get instant, reliable results.

Key Features
• Set up & calculate in minutes – Choose your measurement method, enter your dimensions, and see flow rates instantly.
• Multiple flow methods – Includes popular weirs (V‑Notch, Rectangular, Cipolletti) and flumes (Parshall, Leopold‑Lagco, HS, H, HL, Trapezoidal, and more).
• Area‑velocity mode – Calculate flow for partially full pipes and non‑full channels in various shapes.
• Save favorites – Store common site setups for fast recall.
• Trusted formulas – Based on the ISCO Open Channel Flow Measurement Handbook.
• Easy unit switching – Imperial and metric support.

Free to download and backed by Teledyne ISCO’s decades of expertise in flow measurement.