A water retention pocket should
be provided for the waterfall stonework to be built within. Without
this step, leaks are probable. The retention pocket which
is located under the waterfall acts as a "bib" and
returns water to the pond. One of the least expensive and simplest
methods for creating this retention pocket is with the use of 45 mil EPDM flexible liner material.
The illustration at the top of this page depicts
a liner under the waterfall stonework.
As a general practice, on most waterfalls,
we prefer to install 3" drains at the lowest pool on the waterfall prior to water returning
to the pond. This provides the pond owner with the ability to
open this drain and literally hose down the waterfall as you
would your driveway. This feature dramatically reduces maintenance.
This drain eliminates waste collected in the waterfall from entering
Waterfall rock work is then mortared
to the top layer of concrete. This method protects the liner
from sharp heavy rocks during construction. Note the use of drains
in each pocket of the waterfall. Over time, these waterfall pockets
collect waste materials, which can be easily drained off. Simple
ABS male threaded cleanout plugs serve as plugs for these drain
lines. Bulkhead fittings make the
transition from pipe to liner.