How do I determine the maximum length of the drip pipe?
Up to 100 m² or approx. 300 m at 1.8 m³/h – better as ring or grid.
As a rule of thumb, you can say that if your water source delivers approx. 1.8 m³/h at 3.5 bar, you can water up to approx. 100 m² of bed area. This corresponds to approx. 300 m of drip pipe (because 100 m of drip pipe covers approx. 35 m²).
To ensure that the water is distributed evenly, you should lay the drip pipe in a ring or circle if possible. Laying it in a grid pattern is also an option (e.g. for vegetable beds). This allows the pipe to be fed from several directions.
If you lay the drip pipe as a branch line, you should follow the manufacturer's instructions (often 50–75 m per line), otherwise the pressure at the end will drop too much.
In short: 1.8 m³/h → approx. 300 m of drip pipe at three drip pipe connections → approx. 100 m². A ring/grid is better than a branch.
To ensure that the water is distributed evenly, you should lay the drip pipe in a ring or circle if possible. Laying it in a grid pattern is also an option (e.g. for vegetable beds). This allows the pipe to be fed from several directions.
If you lay the drip pipe as a branch line, you should follow the manufacturer's instructions (often 50–75 m per line), otherwise the pressure at the end will drop too much.
In short: 1.8 m³/h → approx. 300 m of drip pipe at three drip pipe connections → approx. 100 m². A ring/grid is better than a branch.