Short Answer
Most irrigation systems need a dynamic pressure of 1.5–3 bar at the valve. Pop-up sprinklers typically need at least 1.5 bar to pop up and throw effectively, while drip can operate at around 1 bar through a pressure regulator. If your dynamic pressure is too low, a booster pump may be needed.
Pressure requirements
Most irrigation systems need a dynamic pressure of around 1.5 to 3 bar at the valve to perform correctly. Pop-up sprinklers typically need at least 1.5 bar to pop up and throw water effectively, while drip irrigation can operate at much lower pressure, around 1 bar, through a pressure regulator.
Static vs dynamic pressure
Static pressure (measured with no flow) and dynamic pressure (measured while water is flowing) are different, and it is the dynamic pressure that determines whether a system will work.
If your mains static pressure is below about 2 bar, or if the dynamic pressure drops significantly when a tap is opened, a booster pump may be needed to deliver the design pressure to the system.
What to do if pressure is low
A booster pump or break tank with pump can be specified to deliver the design pressure. Both static and dynamic pressure are measured during the site survey, and a pump is specified only if required.
Key Takeaway
Irrigation needs 1.5–3 bar dynamic pressure for sprinklers and around 1 bar for drip — static and dynamic pressure are different, and it is the dynamic pressure that determines whether a system will work.
Frequently Asked Questions
What pressure do pop-up sprinklers need?
Pop-up sprinklers typically need at least 1.5 bar dynamic pressure to pop up and throw water effectively. Drip can operate at around 1 bar.
My water pressure is low — can I still have irrigation?
Yes. If your dynamic pressure is too low, we specify a booster pump or break tank with pump to deliver the design pressure to the system.
How do I check my water pressure?
A site survey measures both static pressure (no flow) and dynamic pressure (while water is flowing). You cannot reliably design a system without these measurements.
Can I use a rainwater tank instead of mains?
Yes. A rainwater tank with a pump can deliver the design pressure independently of the mains supply, and is often the better choice for large gardens.