Irrigation in the Pacific Northwest

Maximum Solution Concentration

Many labels for chemigation specify a maximum concentration in the irrigation lines to prevent corrosion or other problems. This calculates the solution concentration in the irrigation water during chemigation. Learn more about the units used on this page. For more information on calculating chemigation injection rates click here

Chemical Injection Rate:
Water Flow Rate:
Solution Concentration:



The Equation

Use this equation to determine the solution concentration during chemigation.


= Solution concentration in the irrigation lines as a percent.

= Injection rate of the chemical in gallons per hour (gph)

= Flow rate of the irrigation water in gallons per minute (gpm)


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