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STEP-BY STEPS FOR ACCOTINK CREEK, FT. BELVOIR, VA Toe-down Enhanced LPSTP

ACCOTINK CREEK @ AIRFIELD RUNWAY & RECHLORINATION PLANT PROJECTS GARRISON FORT BELVOIR, FAIRFAX, VA CONSTRUCTED Dec 2-5, 2008.

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STEP-BY STEPS FOR ACCOTINK CREEK, FT. BELVOIR, VA Toe-down Enhanced LPSTP

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  1. ACCOTINK CREEK @ AIRFIELD RUNWAY & RECHLORINATION PLANT PROJECTS GARRISON FORT BELVOIR, FAIRFAX, VACONSTRUCTED Dec 2-5, 2008

  2. LONGITUDINAL PEAKED STONE TOE PROTECTION (LPSTP)Built with Virginia DOT Class II stone, level-crested @ 3 ft above the base-flow water surface elevation & trenched 3 ft into the bed. One row of live willow poles (3 poles/ft) planted in the LPSTP & another row (3/ft) laid on top of LPSTP (termed Live Siltation).

  3. STEP-BY STEPS FOR ACCOTINK CREEK, FT. BELVOIR, VA Toe-down Enhanced LPSTP All drawings by Dave Derrick

  4. ACCOTINK CREEK, FT. BELVOIR, VA LOOKING UPSTREAM Typical cross-section for Accotink Creek in the proposed project area

  5. ACCOTINK CREEK, FT. BELVOIR, VA Dig toe-down section of LPSTP 3 ft below bed of stream

  6. ACCOTINK CREEK, FT. BELVOIR, VA Place Longitudinal Peaked Stone Toe Protection (LPSTP) stone in trench

  7. Looking across @ close up of LPSTP stone. CONSTRUCTION-ACCOTINK CR.-RECHLORINATION - DERRICK 12-2008

  8. ACCOTINK CREEK, FT. BELVOIR, VA Place Joint Planting (live willow poles) on top of stone (angled up at least 20 degrees) at the rate of 3 poles per lineal foot.

  9. Looking across @ willow poles on stone. Placing soil on poles. CONSTRUCTION-ACCOTINK CR.-RECHLORINATION- DERRICK 12-2008

  10. ACCOTINK CREEK, FT. BELVOIR, VA Place Live Siltation (willow poles) on top of stone at the rate of 3 poles per lineal foot

  11. Looking US. LPSTP with joint plantings & Live Siltation in place CONSTRUCTION-ACCOTINK CR.-RECHLORINATION- DERRICK 12-2008

  12. ACCOTINK CREEK, FT. BELVOIR, VA At 35 ft spacing intervals, stone Bendway Weirs will be installed that will move the thalweg away from the toe of the LPSTP.

  13. LPSTP with Joint Pole Plantings & Live Siltation with an Erosion Control Blanket

  14. ACCOTINK CREEK, FT. BELVOIR, VA Tuck the Erosion Control Blanket (ECB) at base of slope. Roll ECB out over willows & LPSTP stone. The ECB used here is a 100% coir (Coconut fiber) Rolanka BioD-Mat 40

  15. Install Living Dikes midway between mid-project keys, 3 deep-planted Live Willow Poles per ft.

  16. Hoe starting to dig trench for Living Dike (perpendicular to direction of high flow) CONSTRUCTION-ACCOTINK CR.-RECHLORINATION- DERRICK 12-2008

  17. Looking downhill @ Living Dike trench with willows installed & partially backfilled. CONSTRUCTION-ACCOTINK CR.-RECHLORINATION - DERRICK 12-2008

  18. Looking downhill @ Living Dike trench with willows installed & partially backfilled. Leave bank rough. Ready for ECB. CONSTRUCTION-ACCOTINK CR.-RECHLORINATION- DERRICK 12-2008

  19. ACCOTINK CREEK, FT. BELVOIR, VA Slope bank. A balanced cut/fill in some sections, heavily eroded areas required soil backfill. Backfill anchors the ECB. CUT FILL

  20. Looking US @ erosion control blankets with soil covering the bottom end CONSTRUCTION-ACCOTINK CR.-RECHLORINATION - DERRICK 12-2008

  21. Looking US @ coir blanket & Bendway Weirs in place. CONSTRUCTION-ACCOTINK CR.-RECHLORINATION - DERRICK 12-2008

  22. ACCOTINK CREEK, FT. BELVOIR, VA Install rooted stock plants through ECB as appropriate

  23. Looking US @ workers installing rooted plants thru ECB. CONSTRUCTION-ACCOTINK CR.-RECHLORINATION - DERRICK 12-2008

  24. Looking US @ coir blanket, Living Dikes & rooted plants. CONSTRUCTION-ACCOTINK CR.-RECHLORINATION - DERRICK 12-2008

  25. CONSTRUCTION COMPLETE-Looking US nine months after completion. Most willows browsed by beaver CONSTRUCTION COMPLETE-ACCOTINK CR.-DERRICK 9-13-2009

  26. Man’s best friend, Cleophus Speed Elvis Derrick

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