Contents

  • Cover
  • Front matter
  • Introduction
  • Identifying and managing risk
    • Risk overview
    • Working smart and efficiently
    • Starting the job – be prepared
    • The job is not finished until it is signed-off
  • Basics
    • Roading terms
    • Basics about soil
  • Good construction
    • A well-constructed road
    • A well-constructed landing
  • Earthworks
    • The right machine for the task
    • Clearing and stripping
    • Cut and side cast construction
    • Cut and bench fill construction
    • Full bench construction with end-haul
    • Earthworks compaction
    • Landing construction
    • Forming road corners and in-bends
    • Final grading before metalling
    • Stabilising cut/fill slopes
  • Water control
    • Water control overview
    • Ditches
    • Road drainage culverts
    • Berms and cut-outs
    • Flumes
    • Silt traps and soak holes
    • Silt fences
    • Single culvert river crossings
    • Ford crossings
    • Bridges
  • Applying aggregate (metalling)
  • Repairs and maintenance
    • R&M overview
    • R&M common to new construction
    • R&M of road formation
    • R&M during harvesting operations
    • R&M of river crossings
  • Assisting loggers and harvesting rehab
    • Installing deadmen
    • Installing debris traps
    • Harvesting track rehabilitation (rehab)
    • Harvesting track rehabilitation – cut-outs
    • Landing rehab
  • Want to learn more?
  • Glossary

NZ Forest Road Engineering Manual: Operators Guide

  1.  ›
  2. Assisting loggers and harvesting rehab ›
  3. Harvesting track rehabilitation (rehab)
 

Harvesting track rehabilitation (rehab)

Most logging tracks will need rehab. The amount of rehab depends on the terrain and the soil type. Many will need water controls installed or reinstated immediately after harvest. Tracks can rapidly erode and be a major source of sediment in waterways.

  • Track has closely spaced cut-outs
  • Cut-outs direct water into slash
  • Cut-outs go across the entire track, and are deep enough that water does not go past them
  • The water will continue to scour the soft ash soil
  • Sediment will continue to enter a nearby waterway
  • To fix, put in cut-outs or pull back track to stop erosion
  • Spreading slash is an excellent way to reduce erosion, especially where cut-outs cannot work. For example, in gully bottoms
  • Slash slows water down and traps sediment
  • Maintenance had been identified but was not done before the heavy rain
  • Large amounts of sediment can be created even from short tracks
  • Installing cut-outs on the track would significantly reduce the sediment
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