Irrigation in the Pacific Northwest

Chemical Injection Rate (Water Chemistry Control)

Use this to calculate the injection rate needed to control the chemical concentration in the irrigation water. This is common for drip irrigation to control algae growth for example.

For more information on calculating chemigation injection rates click here

Learn more about the units used on this page.

 

Irrigation Water Flow Rate:
Desired Chemical Concentration:
ppm
Concentration of Chemical in Injected Solution:
Calculated Chemical Injection Rate:

 

 

The Equation

When calculating the injection rate needed to control the chemical concentration in the irrigation water use this formula.

Where

= Chemical injection rate in gallons per hour (gph).

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

= Desired chemical concentration in parts per million (ppm).

= Percent of chemical in injected solution (%)

 

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