Flushing manifold

Drip laterals need periodic flushing to expel contaminant build-up.

Flushing is the opening of the end of a drip lateral to expel contaminants. To achieve adequate flushing, a high velocity flow of water is required.

Flushing regimes are discussed in detail in Module 4 – Maintenance, but the installation of a flushing manifold needs to be decided when designing your irrigation system.

In a manual (non-flushing) manifold system, the flushing is done manually through the opening of each drip lateral.

In a flushing manifold system, all drip laterals are connected to an end flushing manifold, which has a valve that vents to atmosphere. Flushing is as simple as opening the flushing manifold valve to expel debris from the drip system. Even this valve can be automated.

In times of labor challenges, it makes sense to also automate the maintenance of drip line cleaning (flushing) as much as possible.

To achieve the high velocity required for flushing, not all laterals of a block are opened at once. They are opened as sets to allow the higher velocity. This point is also explored further in Module 4.

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