Quote:
Originally Posted by intarsiabox
36" is what the pond builders around Edmonton recommend for over-wintering koi. You don't get -30 degree weather in Burnaby so you could probably go shallower. Just phone up any pond installer in your area and they'll be able to tell you the depth required. IMO a liner is the way to go because you can use whatever design you choose without limits.
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Flexible liner is the only way to go althouhg I did use a preformed for my header pool for my waterfall.