LPED Irrigation

Low Pressure Effluent Distribution (LPED) is a low-pressure irrigation system. Lines of equal length are laid 1 – 1.5m apart (spacing is dependent on local council regulations) on a level contour, they can either be covered with mulch or buried in the topsoil.

The laterals are fed from a manifold at the head of the field, ensuring an even distribution across the field. The irrigations lines are a 25mm lateral with holes drilled at consistent spacings. The size and number of the holes is calculated by our design technicians for each project. Innovative squirt guards developed here at Waterflow, clip over each hole to stop it spraying into the air.

LPED irrigation is the most robust irrigation system for discharging wastewater. Larger pipe and orifice sizes, mean it isn’t prone to blockage; in the worst case scenario, the larger pipe also means it is possible to clear a blockage. LPED takes more care in the design stage, as there are limitations on the individual line lengths and total field sizes. Failure to design it correctly can result in ponding and uneven distribution. If you are unsure, just give us a call and we will be happy to help.

The most important part of an LPED system is the Manifold. The Manifold ensures the even distribution of water to each lateral line in the system.
Squirt Guards
Purple squirt guards are used to stop the spraying of water in the air, or break out through the ground in a buried system. Waterflow has it's own product designed for fast and simple installation.
Flush Taps
Like all irrigation systems, the LPED irrigation will have flush taps at the end of the laterals. This allows the flushing out of any contaminants that might build up over time.

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NaturalFlow Wastewater Treatment Systems frequently use Low Pressure Drip Irrigation (LPED) dripline. This dripline requires squirt guards to prevent spraying in the disposal area.

Traditional squirt guards are cut from 65mm drain coil. These are cut into 300mm long ‘squirt guards’ which are threaded over the pipe and pinned over the holes in the LPED system. In subsurface situations, either 600mm long or full length drain coil sections have been used; this prevents the holes clogging with soil and is intended to spread the distribution. Threading sections onto the dripline is time consuming, and full-length sub surface drain coil has caused unequal distribution resulting in ponding and breakout.

The new generation of squirt guard is now available. The Natural Flow squirt guards are a smart clip-on system, allowing the lines to be pinned, drilled and then squirt guard fitted; in that order. We have found this process to be faster and more efficient than the traditional way. This new method also allows the installer to ensure all holes are drilled on the top of the line, which improves the distribution across the field.

The same method can be used in subsurface situations, with no requirement for drain coil. The catchment in the squirt guard, coupled with larger discharge holes, makes this an effective way of infiltrating the soil with effluent. Removing the drain coil has reduced tracking along the LPED trenches, reducing the likelihood of break out and ponding.


Installation of Squirt Guards

  1. Lay LPED lines and pin to the surface with weed mat pins.
  2. Drill holes in dripline as per design specification. Holes drilled through the top of the line only.
  3. Clip on Squirt Guards over each hole drilled in the dripline.


Squirt Guard Cross Section


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