Design Code of Practice & Standards

The Farm Dairy Effluent (FDE) Design Code of Practice and Standards are industry-agreed standards for the design and installation of effluent management systems.


This document underpins the Farm Dairy Effluent System Accreditation programme.

The purpose of this document is to guide designers through the process of developing a farm dairy effluent (FDE) system, from the initial site investigation through to commissioning of the final system. It provides a general design approach, including lists of things that must be taken into consideration. It also provides a set of standards against which to assess the design of individual farm dairy effluent (FDE) systems in New Zealand. Click here to download a copy.




Soils across New Zealand have been classified into high and low soil risk categories for farm dairy effluent application. This field guide will take you step by step through the process of working out the soil risk for a farm. Click here to download a copy…….


Farmers Guides


When making the decision to install a new farm dairy effluent system, there are a number of things to consider. This document helps you, the farmer, ask the right questions and get the right advice and service. This will result in the most appropriate farm dairy effluent system being installed. Click here to download a copy…….


The DairyNZ Farm Dairy Effluent Spreading Calculator app (available for iOS and Android) allows farmers to easily calculate nutrient loadings and application rates for their dairy effluent based on a number of customisable inputs. This app means that farmers can manage the application of their effluent nutrients with greater precision.

There are two calculators in this app, the Quick Calculator which is for spray irrigation systems such as travelling irrigators & sprinklers, and an Advanced Calculator which is for slurry tankers and muck spreaders. Click here to dowload the app.