Forest Road Deactivation Practices
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18 - Cross-Ditching Practices in Pullback Sequence of Activities, Armoured Swales

Description

Cross-ditches in pullback are used to restore natural hillslope drainage patterns to their natural (pre-construction) locations. They are placed in natural depressions, gully channels, and swales which have evidence of seepage flow above the road.

Figure 17: Cross-Ditch in Pullback
diagram: cross-ditch in pullback

Suggested Sequence of Activities

  1. To locate native ground and establish a stable area for the pullback, you must decompact, remove and outslope the road surface on the far side of the cross-ditch.
  2. Remove the ballast from the cross-ditch location, and excavate a bench to position the machine for further reach downslope. Place as much pullback as possible on the woods side bench.
  3. Clear the outlet of debris and fill material. Place as much material as possible on the woods side of the cross-ditch. Place remainder on the camp side of the cross-ditch.
  4. Excavate the cross-ditch from outlet to inlet. Place as much material on woods side of cross-ditch to fill bench to top of cutslope.
  5. Decompact, remove and outslope the road surface on the camp side prior to finishing cross-ditch pullback.
  6. Blend slopes of pullback into existing slopes above and below the road, in and out of the gully.

Armoured Swale

This is a rock-filled depression which is removed after deactivation.

Figure 18: Armoured Swale
diagram: armoured swale
18 - Cross-Ditching Practices in Pullback
 
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Table of Contents Table of Contents   		Next Next
Introduction  1  section 01
Water Management  2  section 02
Revegetation  5  section 05
Sediment Control  6  section 06
section 13  13  Blanket Drains
section 14  14  Trench Drains
section 15  15  French Drains
section 16  16  Fords
section 18  18  Cross-Ditching in Pullback
section 24  24  Pre-Work Checklist
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