Trenches & Boarholes

PCDI Irrigation

LAS Systems

In New Zealand PCDI (Pressure Compensating Drip Irrigation) is one of the most common methods of applying treated wastewater to land.

It’s why at WaterFlow we don’t just focus solely on the treatment system like others do. We consider your vision for your property first and then find the LAS that will achieve this and finally the wastewater treatment system that will match and meet your needs.

Your LAS or ‘Disposal Field’ has the largest ‘footprint’ of all of the components and is the ‘subject’ of most Council regulations, involving ‘setback’ distances from features like buildings, waterways, flowpaths, stormwater drains, ponds/dams, bores, ground water/water tables, flood zones, boundaries etc… There is also requirements around steepness of slopes to consider which can have a bearing on which LAS you can get consented, on your site, such as irrigation type fields verses soakage type fields.

The Waterflow Team is well versed in all those constraints and options and very passionate about helping you design the ultimate LAS for your property.

Conventional Soakage Trench Soakage trenches are much the same as soakage beds, however they are no more than 0.5m wide.

There are a few variations to these, such as sand trenches and deep trenches. Conventional soakage trenches are not so commonly used and depend on council regulations as to their use. If you’re unsure, then get in touch with us early on in your project and we can help you.

Raised Mounds Similar in principle to ETS beds, these are built up and constructed above ground rather than being dug in. Their purpose is to minimise the possibility of groundwater contamination.

Raised mounds are ideal if there is an elevated water table or a flood prone area, where it is necessary to lift the height of the discharge.

Boreholes  Deep bore holes are typically 0.6m in diameter and 6.0m deep, the number of holes is determined by a four-hour soakage test. The boreholes have a discharge pipe down the centre and are filled with coarse aggregate.

Since these require resource consent and aren’t a permitted activity under any council in New Zealand, boreholes are only used on small sites with very limited options for discharge.

We're here to help, get in touch with us to Get a Free Site Assessment as early into your project as you can, and we can recommend the best land application system for your site or property.

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