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This app calculates flow rates in open, non-full channels and pipes. Use this app to spot-check the performance of installed flow monitoring systems, or verify that newly installed flow meters are configured correctly. This app includes level-to-flow rate calculations for primary devices and area-velocity flow rate calculations for a variety of conduit shapes.

You can display flow rate units as cubic feet per second (cfs), gallons per minute (gpm), or million gallons per days (mgd). By changing the app settings to SI units, you can display flow rates as liters per second (lps) or cubic meters per hour (m3h).

Level-to-Flow Rate Calculations for Primary Devices
Enter the head height using convenient sliders to calculate flow rates in the following primary devices:
• Parshall flumes from 1 inch to 12 feet (0.0254 to 3.66 m)
• Palmer-Bowlus flumes from 4 to 30 inches (0.102 to 0.762 m)
• V-notch weirs: 22.5, 30, 45, 60, 90, 120 degrees
• Rectangular weirs with end contractions from 1 to 10 feet (0.3 to 3.0 m)
• Rectangular weirs without end contractions from 1 to 10 feet (0.3 to 3.0 m)

Area-velocity Flow Rate Calculations
Enter the head height, velocity, and dimensions to calculate flow rates in these channel shapes:
• Round pipes to 30 feet (10 m) in diameter
• U-shaped channels to 30 feet (10 m) wide
• Rectangular channels to 30 feet (10 m) wide
• Trapezoidal channels to 30 feet (10 m) wide
• Elliptical pipes to 30 feet (10 m) wide

Save your frequently-used calculations as Favorites. This handy feature lets you quickly access calculations by site name and map your location when GPS data is available.

All flow rate calculations are based on equations published in the Isco Open Channel Flow Measurement Handbook, Sixth Edition. This definitive reference book, published by Teledyne Isco, is widely used by water and wastewater monitoring professionals. For more information about the handbook, visit www.teledyneisco.com/flowbook.

Disclaimer: The equations used in this calculator were obtained from sources deemed to be reliable. Neither Teledyne Isco nor anyone acting on its behalf makes any warranty with respect to the accuracy, completeness, or usefulness of the app features. Teledyne Isco shall not be held liable for any damages that arise from the use of this app.

What’s New

Version 1.1.1

- Minor bug fixes

Ratings and Reviews

3.5 out of 5
17 Ratings
17 Ratings
Kmccabe73 ,

isO11 Update

This is a great app, but the developer needs to update to be compatible with isO11 for iPhone.

Much better than flipping through the manual.

tx chopper ,

Awesome app please update.

The people I work with would pay for this app if it’s a cost issue to update.

NAMartens ,

Love this app!! Need it for real!!

Please update! Really use this app all summer long at the Ranch I work at. Really need it!


Teledyne Isco Inc.
4.5 MB
Requires iOS 4.3 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2012, Teledyne Instruments, Incorporated


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