APPENDIX 1 Structure Diagrams Conceptual 122122.pdf
PDF 859 KB Posted
- Attached to
- S. Fork Skanaxheen Stream Restoration Federal contract opportunity
- Solicitation number
- 1240BF23Q0042
- Issued by
- Department of Agriculture Forest Service
About this file
This document contains conceptual design plans and drawings for stream restoration structures on the South Fork of Skanaxheen Creek located on Kuiu Island in the Tongass National Forest in Alaska. The designs show Formidable Multi-Faceted Large Wood Complexes, Terrace Barbs, and Bar Buddies structures that would be constructed using logs, trees, boulders, and other natural materials to restore aquatic habitat, control erosion, and improve hydrologic function. The related federal contract opportunity is for non-personal stream restoration services on the South Fork Skanaxheen and has an estimated value of $1.24 million. The opportunity was issued by the USDA Forest Service and worksites are only accessible via barge due to the remote Southeast Alaska location.
View the file
Other files for this federal contract opportunity
| File | Type | Posted |
|---|---|---|
| Appendix 5 Maps .pdf | ||
| Attachment 1 Stream Resto Perforamnce Work Statement.pdf | ||
| APPENDIX 3 CAMPSITES CAMPGROUND.pdf | ||
| APPENDIX 4 FIRE PREVENTION.pdf | ||
| Attachment 2 SCA WD 2015-5685 R19 12.27.22 Tongass.pdf | ||
| APPENDIX 2 USDA Forest Service Land Access Permit.pdf | ||
| 1240BF23Q0042 S.Fork Skanaxheen Stream Restoration.pdf | ||
| Attachment 3 Schedule of Items Quote Sheet.xlsx | XLSX spreadsheet |
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Text version
Formidable Multi-Faceted Large Wood Complex
1 1
Plan View
Terrace
3 & 4
Direction of Flow
NOTES: 1) Excavate toe log trenches perpendicular to flow and into bank below bed surface at maximum predicted scour depth. Place toe logs up to stream bed elevation. 2) Excavate torsion Log trenches angled 15 - 20% to flow down to bed surface/toe log elevation. Place torsion log on top of toe log out into stream channel. 3) Place tree with rootwad in torsion trench hooking the on top of torsion log with the rootwad. 4) Continue alternating toe and torsion log placement, tapering the structure elevation up toward bank/terrace. Final log placements should exceed the Q100 elevation. 5) Place/ weave additional trees, logs, large boulders, slash or root-wads in apex of structure. 6) Place ample slash and small woody debris on the up-stream bank interface of the structure.
South Fork Skanâxheen Creek Restoration Project Tongass National Forest
STRUCTURE: FMF Complex – Plan View DESIGN: Brian Bair DRAWN BY: Brian Bair
DATE: 03/17/2010
REVIEWED: H. Whitacre Date: 12/2022
FMF Formidable Multi-faceted Terrace Barbs
Plan View
3 & 4
Constructed Terrace
NOTES:
Direction of Flow
1) Excavate toe log trenches perpendicular to flow and into bank below bed surface at maximum predicted scour depth. Place toe logs up to stream bed elevation. 2) Excavate torsion Log trenches angled 15 - 20% to flow down to bed surface/toe log elevation. Place torsion log on top of toe log out into stream channel. 3) Place tree with rootwad in torsion trench hooking the on top of torsion log with the rootwad. 4) Continue alternating toe and torsion log placement, tapering the structure elevation up toward bank/terrace. Final log placements should exceed the Q100 elevation. 5) Place/ weave additional trees, logs, large boulders, slash or root-wads in apex of structure. 6) Place ample slash and small woody debris on the up-stream bank interface of the structure.
South Fork Skanâxheen Creek Restoration Project Tongass National Forest
STRUCTURE: FMF Terrace Barbs -Plan View DESIGN: Brian Bair DRAWN BY: Brian Bair
Formidable Multi-Faceted Large Wood Complexes & Terrace Barbs Cross-Section View
Direction of Flow
Bank / Terrace
Q 100 Discharge Elevation 2
Gravel Bar
Q 1.2 Discharge Elevation
Stream Bed
Maximum Predicted Scour Depth 1
NOTES:
1) Excavate toe log trenches perpendicular to flow and into bank below bed surface at maximum predicted scour depth. Place toe logs up to stream bed elevation. 2) Excavate torsion Log trenches angled 15 - 20% to flow down to bed surface/toe log elevation. Place torsion log on top of toe log out into stream channel. 3) Place tree with rootwad in torsion trench hooking the on top of torsion log with the rootwad. 4) Continue alternating toe and torsion log placement, tapering the structure elevation up toward bank/terrace. Final log placements should exceed the Q100 elevation. 5) Place/ weave additional trees, logs, large boulders, slash or root-wads in apex of structure. 6) Place ample slash and small woody debris on the up-stream bank interface of the structure.
South Fork Skanâxheen Creek Restoration Project Tongass National Forest
STRUCTURE: FMF – X-Section View DESIGN: Brian Bair DRAWN BY: Brian Bair
Bar Structure - Bar Buddies 2 Plan View
Direction of Flow
1 4 4 3
Island
5 4 2
NOTES:
Direction of Flow
South Fork Skanâxheen Creek Restoration Project Tongass National Forest
STRUCTURE: Bar Buddy– Plan View DESIGN: Brian Bair DRAWN BY: Brian Bair
DATE: 03/17/2010
REVIEWED: H. Whitacre Date: 12/2022
1) Excavate and place toe/rack logs perpendicular to flow, below predicted maximum scour depth. 2) Excavate and place sound trees with rootwads or drive pilings to predicted maximum scour depth behind toe/rack logs. 3) Place, Integrate/interlock backer logs with toe/rack logs, and pilings. Backer/toe logs are placed in lifts, covered with cobble and gravel and then bucket compacted with the excavator. 4) Place trees with intact root wads on top of and bracing the upper most toe log, root wads facing up-stream. 5) Place ample slash and small woody debris on the up-stream interface of the structure.
Bar Buddies – Bar Structures Long-Section View
Slash/Stumps/Small Woody Debris 2
Q2-Q100 Discharge Elevation 5 2 4
Flow 4 2
Gravel Bar
NOTES:
Maximum Predicted Scour Depth South Fork Skanâxheen Creek
Restoration Project Tongass National Forest
STRUCTURE: Bar Buddy– Long-Sec View DESIGN: Brian Bair DRAWN BY: Brian Bair
DATE: 03/17/2010
REVIEWED: H. Whitacre Date: 12/2022 1) Excavate and place toe/rack logs perpendicular to flow, below predicted maximum scour depth. 2) Excavate and place sound trees with rootwads or drive pilings to predicted maximum scour depth behind toe/rack logs. 3) Place, Integrate/interlock backer logs with toe/rack logs, and pilings. Backer/toe logs are placed in lifts, covered with cobble and gravel and then bucket compacted with the excavator. 4) Place trees with intact root wads on top of and bracing the upper most toe log, root wads facing up-stream. 5) Place ample slash and small woody debris on the up-stream interface of the structure.
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