What is pressure compensation?

Drip irrigation systems apply water to plants at very low flow rates. This minimizes water losses caused by evaporation and confines the water within the root zone of the plant, where it is truly necessary. Pressure compensation is a term used to describe an emitter that maintains the same water output at various water inlet pressures. Therefore, these emitters compensate for uneven terrain, the length of the mainline pipe, and the variable inlet flows.

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Self-compensating drippers ensure that every plant in an irrigation system receives the exact same amount of water and fertilizer, regardless of location, permitting a uniform and high-quality growth on any topography. Here are some reasons why it is advisable to use pressure compensating drippers compared to drippers that do not compensate for fluctuating pressure:

• If the crops are growing on sloping or uneven terrain, these drippers prevent over-irrigation and under-irrigation in the lower and upper areas of the system.

• If you want a more accurate and uniform distribution of water among all plants.

• If you want a healthy and uniform plant growth.

• If you want to improve the quality, quantity, and uniformity by using fewer resources.

Advantages of pressure-compensating drippers Pressure-compensating drippers facilitate keeping your irrigation system controlled, since each dripper emits a pre-established flow rate (e.g. 2 liters per hour), allowing you to easily calculate the water emitted for a certain period of time. This ensures a more efficient irrigation process, reducing the risk of excessive or insufficient system water flow rate. A non pressure-compensating emitter will have variable output flows at variable input pressures. Therefore, the flow will vary along the uneven terrain and each dripper will emit a different amount of water depending on its position on the mainline pipe. The pressure along the mainline pipe with installed drippers may vary due to the ground slopes and the length of the mainline pipe itself. If an irrigation system is installed on a slope, there will be a higher water pressure in the lower part of the slope compared to the upper part. Consequently, non pressure-compensating drippers in the lower part will emit more water than those in the upper part. Pressure-compensating drippers will emit the same amount of water along the slope, ensuring a more uniform irrigation on uneven ground.