Irrigation Trenching NZ

Irrigation trenches generally need a flat, even trench bottom — a bedding layer is usually placed before the pipe or lateral goes in — and a width that comfortably accommodates the pipe diameter plus working clearance. Timing often matters too, with trenching scheduled around the irrigation season and paddock access rather than a fixed civil programme.

A tractor-mounted chain trencher is well suited to long, open irrigation runs across farmland, cutting a consistent trench at production speed off the tractor's own PTO. On rockier ground, a wheel trencher with rock capability keeps cutting where a standard chain would slow down. Trench width should be matched to the pipe or lateral diameter and bedding requirements rather than cut wider than necessary — a wider trench means more spoil and more reinstatement work across the paddock.

Things Worth Considering

• Pipe or lateral diameter and the bedding width required around it
• Tractor horsepower and PTO configuration available on farm
• Length and continuity of the run across open paddock ground
• Ground conditions, including any rock or clay that affects trenching speed
• Timing around the irrigation season and paddock access

Irrigation Trenching is one of the applications TrenchWorks supports most often in the Agriculture sector. For the full range of applications and considerations for that industry, see the Agriculture industry guide, or read the complete Trenchers NZ guide for how this fits into choosing a trencher generally.