Post on 04-Feb-2016
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ACCOTINK CREEK @ AIRFIELD RUNWAY &
RECHLORINATION PLANT PROJECTS GARRISON FORT
BELVOIR, FAIRFAX, VACONSTRUCTED
Dec 2-5, 2008
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).
STEP-BY STEPS FOR ACCOTINK
CREEK, FT. BELVOIR, VA
Toe-down Enhanced LPSTP
All drawings by Dave Derrick
Typical cross-section for Accotink Creek in the proposed project area
ACCOTINK CREEK, FT. BELVOIR, VA LOOKING UPSTREAM
Dig toe-down section of LPSTP 3 ft below bed of stream
ACCOTINK CREEK, FT. BELVOIR, VA
ACCOTINK CREEK, FT. BELVOIR, VA
Place Longitudinal Peaked Stone Toe Protection
(LPSTP) stone in trench
Looking across @ close up of LPSTP stone.
CONSTRUCTION-ACCOTINK CR.-RECHLORINATION - DERRICK 12-2008
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.
Looking across @ willow poles on stone. Placing soil on poles.
CONSTRUCTION-ACCOTINK CR.-RECHLORINATION- DERRICK 12-2008
ACCOTINK CREEK, FT. BELVOIR, VA
Place Live Siltation (willow poles) on top of stone at the rate of 3 poles per lineal foot
Looking US. LPSTP with joint plantings & Live Siltation in place
CONSTRUCTION-ACCOTINK CR.-RECHLORINATION- DERRICK 12-2008
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.
LPSTP with Joint Pole Plantings &
Live Siltation with an Erosion Control
Blanket
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.
Install Living Dikes midway between
mid-project keys, 3 deep-planted Live
Willow Poles per ft.
Hoe starting to dig trench for Living Dike (perpendicular to direction of high flow)
CONSTRUCTION-ACCOTINK CR.-RECHLORINATION- DERRICK 12-2008
Looking downhill @ Living Dike trench with willows installed & partially backfilled.
CONSTRUCTION-ACCOTINK CR.-RECHLORINATION - DERRICK 12-2008
Looking downhill @ Living Dike trench with willows installed & partially backfilled. Leave bank rough. Ready for ECB.
CONSTRUCTION-ACCOTINK CR.-RECHLORINATION- DERRICK 12-2008
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.
Looking US @ erosion control blankets with soil covering the bottom end
CONSTRUCTION-ACCOTINK CR.-RECHLORINATION - DERRICK 12-2008
Looking US @ coir blanket & Bendway Weirs in place.
CONSTRUCTION-ACCOTINK CR.-RECHLORINATION - DERRICK 12-2008
ACCOTINK CREEK, FT. BELVOIR, VA
Install rooted stock plants through ECB as appropriate
Looking US @ workers installing rooted plants thru ECB.
CONSTRUCTION-ACCOTINK CR.-RECHLORINATION - DERRICK 12-2008
Looking US @ coir blanket, Living Dikes & rooted plants.
CONSTRUCTION-ACCOTINK CR.-RECHLORINATION - DERRICK 12-2008
CONSTRUCTION COMPLETE-Looking US nine months after completion. Most willows browsed by beaver
CONSTRUCTION COMPLETE-ACCOTINK CR.-DERRICK 9-13-2009
Man’s best friend, Cleophus Speed Elvis Derrick