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. Repairs and maintenance ›
  3. R&M of river crossings
 

R&M of river crossings

River crossings need regular R&M, especially after storms. R&M is often to clear debris and fix scouring of inlets, outlets and abutments.

  • Gravel removed from blocked culverts
  • The damage was fixed by rock and concrete re-enforcement
  • Road approaches fixed
  • Do not put storm deposited silt removed from the crossing on the bank
  • Truck spoil away from the immediate area
  • Remove debris before it becomes a significant problem
  • Once debris blocks the culvert, the water needs to go somewhere else
  • Since the culvert is located at the lowest point, water will go over the top
  • This will scour out the culvert
  • This is a common and challenging problem to fix, especially in rivers with lots of woody debris
Prev page Next page
Forest Owners Association

© 2023 New Zealand Forest Owners Association

Website by RS