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Especially in the hot season, watering the lawn or beds is a must. The water pressure is important when using a garden irrigation system or lawn sprinkler in order to guarantee sufficient performance.

In a nutshell

  • 4.0 to 4.5 bar delivery pressure for water from wells or cisterns with the pump
  • Bucket test provides information about the level of water pressure
  • Pumps increase water pressure when operating lawn sprinklers
  • Pressure between 3.5 and 4.0 bar required on the water line

Sufficient water pressure required

When it's hot and dry outside and rain is a long time coming, the garden needs extra watering. Lawn sprinklers and garden irrigation can help here. A private well or cistern with collected rainwater would be an optimal solution. However, not every hobby gardener has such an alternative. Water is usually taken directly from the water pipe. In order to guarantee a good function, a number of things are necessary:

Lawn sprinkler in the garden
  • measured pressure directly at the tap 3.5 to 4.0 bar
  • Use of a garden water meter with a flow rate of at least 2.5 m³
  • Pipe diameter external thread 3/4 inch

Notice: Friction occurs on the inner wall of the pipe or hose. This converts the kinetic energy (energy of motion) of the water into thermal energy. As a result of these friction losses, there is a pressure loss in the water at the same time, and the flow rate of the water also decreases.

The bucket test

There is a simple method for determining the level of water pressure directly at the tap, the so-called "bucket test". You simply measure the time you need to fill a bucket with a capacity of ten liters. A time of 20 seconds or less is a good sign of sufficient pressure.

Use of garden pumps

A pump is necessary, especially if you want to use water from a well or cistern to operate lawn sprinklers or garden irrigation. You need:

  • a delivery pressure between 4.0 and 4.5 bar
  • per meter suction and pressure head 0.1 bar and
  • 0.1 bar friction loss occurs per meter of horizontal transmission

This data must be taken into account when buying a garden pump.

Notice: The delivery head and the hose couplings used have an unfavorable effect on the pressure. With a delivery head of 10 meters, about 1 bar must be applied to cope with the height.

frequently asked Questions

Is a domestic water line sufficient for operation?

Only a certain amount of liquid is let through the pipes and the water tap per hour. It is important to ensure that there is still enough moisture at the end of the irrigation system. If this is not the case, then the area to be irrigated must be reduced. The garden is simply partially watered.

How is the flow rate of a water connection calculated?

First, the time is measured in which a ten liter bucket fills up. The result is then extrapolated to one hour and the water volume is then divided by 1000. This is how the cubic meter per hour (m³/h) is calculated. On this basis, it is possible to calculate the amount of water required for the corresponding irrigation system.

Can the amount of water pressure be influenced?

Yes, there is a possibility. It can easily be increased by using a pump. In addition, a pressure regulator can also be installed directly behind the external connection of a water pipe. In this way, the level of water pressure can be adjusted.

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