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STEP 5
EXCAVATE YOUR WATERFALL BASIN
• R
emove vault and AquaBlox and begin to excavate
approximately 18.5" depth. Once 18.5" depth has been
reached, excavate area for vault an extra 7" down.
NOTE: an additional 6" of excavation is recommended
per side of the basin to allow for AquaBlox dimensions,
sufficient backfill material, and compaction required during
backfilling (Ex. 6).
• Excess soil can be used to create elevation for the
waterfall and stream or as soil for the berm around the
waterfall.
STEP 6
LEVEL BASIN AND TAMP
SOIL
• One of the most important
parts of the excavation is
getting the basin level. Use
a tamper to compact soil
(Ex. 7). Put a level on the
bottom of the basin to
make sure the basin is
level from side to side and
front to back. The base
of the excavation should
be smooth soil, flat, and
free of lumps and debris.
Add compactible material
such as sand if existing
soil conditions do not meet
requirements listed above.
If compactible material
was used, double check to
make sure your basin is still level before proceeding. Use a
tamper for the area where the Pondless Waterfall Vault sits
as this area should be as close to level as possible (Ex. 8).
• Check the size and depth of the excavation by placing the
Pondless Waterfall Vault and AquaBlox into the excavated
area.
• The AquaBlox should sit level on the front ledge of the
Pondless Waterfall Vault, as well as line up level to the side
of the vault. There should be approximately 6" between
the AquaBlox and the sides of your basin. This is to allow
for sufficient backfill material and compaction required
during backfilling (Ex. 9).
STEP 7
PLACE UNDERLAYMENT AND LINER
• Remove any sharp objects from the excavated basin that
may damage the liner.
• Remove the AquaBlox and Pondless Waterfall Vault from
the basin in order to install the underlayment and liner.
• Unfold the underlayment fabric and place into the
excavated basin. Starting from the bottom, remove the
slack from the underlayment, making sure it conforms into
all of the sides. Make sure you leave enough underlayment
to cover your stream and waterfall location (Ex. 10).
• Place the EPDM liner on top of the underlayment.The
installation process is the same as the underlayment,
starting at the bottom and contouring the liner up and out
of the basin.
• Try to get large folds out, the main goal is to have the
liner lying flat and going into all corners. Don’t try to get it
perfect, you will hide the liner with rocks and gravel later.
• Make sure the liner is high enough around the edges of
the basin. Problems can be fixed by readjusting the liner
into the excavation, backfilling (making the basin smaller)
in areas where there is not enough liner (Ex. 11).
Ex. 7
Ex. 8
Ex. 9
AquaBlox
Liner
Underlayment
Excavated Outer Basin Wall
Ex. 10
25.5"
48"
23"
7"
18.5"
Ex. 6
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