ACCOTINK CREEK @ AIRFIELD RUNWAY

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ACCOTINK CREEK _at_ 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 _at_ 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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ACCOTINK CREEK, FT. BELVOIR, VA LOOKING
UPSTREAM
Typical cross-section for Accotink Creek in the
proposed project area
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ACCOTINK CREEK, FT. BELVOIR, VA
Dig toe-down section of LPSTP 3 ft below bed of
stream
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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 _at_ 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 _at_ 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.
Roll ECB out over willows LPSTP stone.
The ECB used here is a 100 coir (Coconut fiber)
Rolanka BioD-Mat 40
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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 _at_ Living Dike trench with
willows installed partially backfilled.
CONSTRUCTION-ACCOTINK CR.-RECHLORINATION -
DERRICK 12-2008
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Looking downhill _at_ 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
Slope bank. A balanced cut/fill in some
sections, heavily eroded areas required soil
backfill. Backfill anchors the ECB.
CUT
FILL
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Looking US _at_ erosion control blankets with soil
covering the bottom end
CONSTRUCTION-ACCOTINK CR.-RECHLORINATION -
DERRICK 12-2008
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Looking US _at_ 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 _at_ workers installing rooted plants
thru ECB.
CONSTRUCTION-ACCOTINK CR.-RECHLORINATION -
DERRICK 12-2008
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Looking US _at_ 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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Mans best friend, Cleophus Speed Elvis Derrick