I live just north of Grand Rapids Michigan
& would like to build a large koi pond & waterfall.
I want to landscape around it w/ plants trees & bushes.
I've looked into pond liners but worry the tree roots will
puncture it. Can I build a pond with concrete or mortar? I
would appreciate your advice on the pros & cons on this
project.
Laura
Hi Laura,
The fear you voice is a common misconception. Tree roots
grow out as fine tendrils and thicken as the shade line
of the tree expands. About the only plant with root systems
capable of damaging a 44 mil EPDM liner is bamboo. As long
as a liner pond has an adequate underlayment of heavy-duty
garden fabric, old blankets, tarpaulins or similar material,
your pond is safe. Most leaks are caused by careless handling
of rock, bad piping and improper liner seam technique.
Concrete is certainly a possible building
material, but requires a certified ferrocrete contractor,
extensive pre-construction with rebar (interlocked steel
rod) and costs the earth. Any piping you want to do has
to be carefully pre-planned and laid in prior to your pour,
and once in, is there forever. Poured concrete is great
if you are a multi-million dollar international corporation
showing off your new headquarters, but it is impractical
for the beginning backyard ponder, especially when you remember
that a pond enthusiast generally builds between five and
six ponds of steadily increasing size during his or her
career. It's easier to pull up a liner than to dynamite
out reinforced concrete. Easier on the neighbors, too. Besides,
concrete leaks, and wide temperature swings (as in Central
Michigan) can cause heaving and cracks.
There is a new resin-based pond construction
material out there, but it costs the earth and the rest
of the solar system.
Look up your local water gardening society
and ask for a referral to a reputable contractor in your
area. He'll be able to advise you on the best construction
materials for your locale.
