WATER VOLUME
The Echo Chamber holds 100 gallons of water. As a rule of thumb, your pond-free basin
should hold three times the amount of water as the waterfalls and streambeds above it. This
means that one Echo Chamber will accommodate a streambed that holds 33 gallons of water.
Use the formula below to calculate the streambed
volume of your project (Figure 10).
STREAMBED VOLUME
Multiply (in feet) the average length x the
average width x the average depth of water
to find cubic feet of streambed volume.
Multiply cubic feet x 7.48 = gallons
EXC AVATING AND SETTING THE ECHO CHAMBER
Dig a hole approximately 3’ wide, 4’ long and 26” deep. Do not dig too deep. The Echo
Chamber should be set on undisturbed earth if possible. In the case that you over-dig, be sure
to compact the soil thoroughly to prevent settling. The bottom of the hole should be level
side-to-side and front-to-back.
Place the Echo Chamber into the excavated hole. The top lip of the Echo Chamber should
be about 1” above the surrounding grade. Check the top of the chamber to make sure that it
is level front-to-back and side-to-side. Place a few stones inside the Echo Chamber at this time
to weigh it down and keep it from moving.
Install the 1 ½” solid support tubes and begin backfilling. The support tubes must be in place
for the enclosure to retain its shape during the back-filling process. Loosely backfill the Echo
Chamber on all sides, lightly compacting as you go. Do not over compact the soil! Aggressive
compaction may deform the enclosure and cause components to fit improperly.
9
Figure 10.
ECHO CHAMBER INSTALLATION
The Echo Chamber patented design enables it to hold three times more water in the same
amount of space as traditional gravel basins. The Echo Chamber is also modular. Multiple Echo
Chambers can be plumbed together to increase water volume (for longer streambeds), or to
increase the basins width (for wider waterfalls). The versatility and ease of installation is what
makes the Echo Chamber the best choice for pond-free features.
WIDTH
DEPTH OF
WATER
LENGTH
2” DEEP = .16”
3” DEEP = .25”
4” DEEP = .33”
5” DEEP = .42”
6” DEEP = .5”
Figure 11.
ATTACHING THE LINER
LIMITED SPLASH
Remove the support bars. Drape approximately 1’ of pond
liner over the side of the Echo Chamber. Replace the support
tubes one at a time starting at the center and working your
way to the outside walls. Once you have inserted the
support bars, install the top grate(s) (Figure 11).
EXCESSIVE SPLASH
Use some of the soil from the excavation of the
hole to build up the area around the Echo Chamber,
creating a dish effect. Leave the support tubes in place
and pull the liner over the top of the Echo Chamber.
With a sharp razor knife, cut a hole in the liner above the Echo Chamber.
