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 – cut-outs
 

Harvesting track rehabilitation – cut-outs

Cut-outs are the most common stormwater control measure used to rehab tracks.

Where is a good place to put in a cut-out?

Step 1: Get the spacing right

  • The steeper the track, and the more erosion-prone the soil is, the closer the cut-outs need to be
  • On some tracks, cut-outs need to be very close
  • Use the table below as a guide
Table 14: Spacing guide for cut-outs

Step 2: use the terrain to decide where to put them in

Use the shape of the land to help locate the best spots:

  1. In the bottom of track dips or undulations
  2. Where water can drain off the track and onto stable ground
  3. Where they don’t go directly into water bodies

H​ow do you construct a good cut-out?

These things make a good cut-out:

  • Constructed across the entire track
  • Angle it downslope to help drain water
  • Ensure there is no ponding
  • Build a small compacted bund on the downhill side to stop water going over the top of it
  • Dig at least 300 mm deep
  • Build the exit on stable ground, so it does not erode and create sediment
  • Drain water into a slash filter, soak hole or sediment trap where needed
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