Habitat Based Shoreline Stabilization

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Habitat Based Shoreline Stabilization

• Practical Techniques for Landowners

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Key Features of Stabilization

• Slope
• Habitat/Structure
• Soil Containment
• Toe Protection

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Key Features of Stabilization

• Slope
• Where feasible reduce slope to a minimum of 21
  and a preferred 4 or 51
• Pull back of slope is preferable
• Cut and fill (minimized) to reach preferred slope
  is permissible

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Slope
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Slope
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Key Features of Stabilization

• Habitat/Structure
• Vegetation of newly sloped back
• Native vegetation preferable
• Plant appropriate species and various inundation
  levels
• Add large woody debris at toe and along slope to
  add bank complexity and anchoring structure for
  future vegetation
• Root wads and logs can be used for this purpose

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Habitat
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Habitat
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Key Features of Stabilization

• Soil Containment
• Use non-woven filter fabric under rip-rap to
  contain soils from erosion
• Water can still remove soils from projects
  without use of filter fabrics
• Filter fabrics can be easily planted through to
  add vegetative components

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Soil Containment
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Soil Containment
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Key Features of Stabilization

• Toe Protection
• Use rip-rap to protect toe erosion and bank over
  steepening
• Plant the interstitial spaces of riprap to add
  vegetative complexity
• Use of rip-rap over the entire bank is not
  necessary to protect shoreline erosion

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Toe Protection
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Toe Protection
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Cost Estimating

• Factors affecting estimation and costs
• Bank height
• Severity of condition (vertical or stepped)
• Existing vegetation on site
• Accessibility for heavy equipment
• Proximity to structures/ability to slope banks
• Contractor knowledge
• Contractor availability
• Material variability and cost volatility

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Cost Estimating

• Rip-rap - 30 per Yard _at_ up to 1 yd/linear ft. of
  shoreline
• Filter Fabric - 2 per foot _at_ 12 foot wide
• Staples - 50 per box (good for about 100)
• Plants - free to 10 each depending on size and
  species
• LWD free to ? Depends on location,
  transportation costs, mill or local, etc
• Labor - 13 to 20 per hour
• Heavy Equipment costs - 60 to 100 per hour
  depending on type needed

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Cost Estimating

• Typical 100 foot section
• Low end - 25/linear foot
• High end - 90/linear foot
• Avg. cost 50/linear foot
• Typical 100 homeowner looking at an investment
  of about 5,000 on average

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Project Example Tacoma Creek
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Project Example Tacoma Creek
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Project Example Tacoma Creek
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Project Example Hoodoo Creek
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Project Example Hoodoo Creek
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Project Example Hoodoo Creek
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Project Example Middle Creek
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Project Example Middle Creek
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Project Example Middle Creek