COPING STONE
WATER LEVEL
Detail D
12”
Under Gravel Suction Grid – When installing an
GRANITE ROCK
under gravel suction grid we are typically using a 2"
manifold assembly for the suction grid with a series
of three 3/8" holes every 6" across the bottom of the
suction grid. We recommend using a 6" layer of 3/4"
ROUND gravel covering the top of the suction grid
by approximately 2". All ends of the manifold will be
capped and each cap will have one 3/8" hole drilled at
the bottom side of the cap.
12”
48”
30”
52”
3/4” ROUND GRAVEL
6”
1” AIR RING
GEOTEXTILE UNDERLAYMENT
2” MANIFOLD SUCTION GRID
45 MIL E.P.D.M. LINER
COPING STONE
Detail E
Dedicated Koi Pond – Since the Dedicated Koi
Pond will not have any rocks to support the walls of
excavation we suggest taking proper measures to
create support for your coping stones so the edges
of your pond do not collapse. In this case we have
described a concrete bond beam around the perimeter
of the pond to support large coping stones that will
frame the water’s edge. Notice the excavation is
different than all the other excavation details with a
curved bottom wall transition that tapers towards a
bottom drain. This detail may not be necessary in all
soil conditions and may not be adequate in sandy
conditions or depths greater than 48".
WATER LEVEL
9”
#4 REBAR
8”
16”
36”
48”
CONCRETE BOND BEAM
GEO-TEXTILE
UNDERLAYMENT
45 MIL E.P.D.M. LINER
BOTTOM DRAIN ATTACHMENT
8” TO 12”
ROUND
PEA GRAVEL
MARGINAL AQUATIC PLANTS
12”
12”
GRANITE
BOULDERS
2” PVC BOG MANIFOLD
45 MIL E.P.D.M. LINER
12”
36”
SMOOTH GRAVEL
UNDERLAYMENT
Detail F
Active Bog Plant Shelf – When installing an Active Bog Filter we want to have the same excavation detail as the Static
Bog Plant Shelf in Detail B only a little deaper because we are making room for a manifold assembly of PVC pipe we will be
installing at the bottom of the shelf. We will be pumping water into the bottom of the plant shelf and upflow water through
the gravel bed and aquatic plant roots to greatly improve your pond’s filtration capacity. The manifold assembly we build
out similar to the Under Gravel Suction Grid Detail D. We recommend using ROUND ornamental gravel no smaller than 3/8"
and no larger than 3/4". The depth of the gravel bed should be a minimum of 8" and maximum of 12".
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