STEP-BY STEPS FOR ACCOTINK CREEK, FT. BELVOIR, VA Toe-down Enhanced LPSTP
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Transcript of STEP-BY STEPS FOR ACCOTINK CREEK, FT. BELVOIR, VA Toe-down Enhanced LPSTP
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ACCOTINK CREEK @ AIRFIELD RUNWAY &
RECHLORINATION PLANT PROJECTS GARRISON FORT
BELVOIR, FAIRFAX, VACONSTRUCTED
Dec 2-5, 2008
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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).
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STEP-BY STEPS FOR ACCOTINK
CREEK, FT. BELVOIR, VA
Toe-down Enhanced LPSTP
All drawings by Dave Derrick
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Typical cross-section for Accotink Creek in the proposed project area
ACCOTINK CREEK, FT. BELVOIR, VA LOOKING UPSTREAM
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Dig toe-down section of LPSTP 3 ft below bed of stream
ACCOTINK CREEK, FT. BELVOIR, VA
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ACCOTINK CREEK, FT. BELVOIR, VA
Place Longitudinal Peaked Stone Toe Protection
(LPSTP) stone in trench
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Looking across @ close up of LPSTP stone.
CONSTRUCTION-ACCOTINK CR.-RECHLORINATION - DERRICK 12-2008
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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.
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Looking across @ willow poles on stone. Placing soil on poles.
CONSTRUCTION-ACCOTINK CR.-RECHLORINATION- DERRICK 12-2008
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ACCOTINK CREEK, FT. BELVOIR, VA
Place Live Siltation (willow poles) on top of stone at the rate of 3 poles per lineal foot
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Looking US. LPSTP with joint plantings & Live Siltation in place
CONSTRUCTION-ACCOTINK CR.-RECHLORINATION- DERRICK 12-2008
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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.
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LPSTP with Joint Pole Plantings &
Live Siltation with an Erosion Control
Blanket
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ACCOTINK CREEK, FT. BELVOIR, VA
Tuck the Erosion Control Blanket (ECB) at base of
slope.
The ECB used here is a 100% coir (Coconut fiber)
Rolanka BioD-Mat 40
Roll ECB out over willows & LPSTP
stone.
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Install Living Dikes midway between
mid-project keys, 3 deep-planted Live
Willow Poles per ft.
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Hoe starting to dig trench for Living Dike (perpendicular to direction of high flow)
CONSTRUCTION-ACCOTINK CR.-RECHLORINATION- DERRICK 12-2008
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Looking downhill @ Living Dike trench with willows installed & partially backfilled.
CONSTRUCTION-ACCOTINK CR.-RECHLORINATION - DERRICK 12-2008
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Looking downhill @ Living Dike trench with willows installed & partially backfilled. Leave bank rough. Ready for ECB.
CONSTRUCTION-ACCOTINK CR.-RECHLORINATION- DERRICK 12-2008
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ACCOTINK CREEK, FT. BELVOIR, VA
FIL
L
CUT
Slope bank. A balanced cut/fill in some sections, heavily eroded areas required soil backfill. Backfill anchors the ECB.
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Looking US @ erosion control blankets with soil covering the bottom end
CONSTRUCTION-ACCOTINK CR.-RECHLORINATION - DERRICK 12-2008
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Looking US @ coir blanket & Bendway Weirs in place.
CONSTRUCTION-ACCOTINK CR.-RECHLORINATION - DERRICK 12-2008
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ACCOTINK CREEK, FT. BELVOIR, VA
Install rooted stock plants through ECB as appropriate
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Looking US @ workers installing rooted plants thru ECB.
CONSTRUCTION-ACCOTINK CR.-RECHLORINATION - DERRICK 12-2008
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Looking US @ coir blanket, Living Dikes & rooted plants.
CONSTRUCTION-ACCOTINK CR.-RECHLORINATION - DERRICK 12-2008
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CONSTRUCTION COMPLETE-Looking US nine months after completion. Most willows browsed by beaver
CONSTRUCTION COMPLETE-ACCOTINK CR.-DERRICK 9-13-2009
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Man’s best friend, Cleophus Speed Elvis Derrick