This is before you pour the concrete into the base.
Diy bottom drain for koi pond.
Bottom drains you should fit your bottom drains while the pond is under construction.
Fold the liner over the pipe like a paper towel over a drinking glass.
Place the rubber collar over the liner and pipe.
After you ve got your bottom drains in get all the pipework for the bottom drains laid out in position as well cut to shape lay it then pour in the concrete.
Place a bead of silicone around the pipe s outer perimeter.
For liner ponds remove dirt around bottom drain pipe 6 deep with at least a 9 radius.
Think of a koi pond as a swimming pool for koi.
Install the bottom drain bulkhead fitting 1 below the pond bottom surface.
Pour concrete in area around bottom drain and contour as per the following drawing.
4 gravity flow bottom drains should optimally have a max flow rate of approximately 3600 gallons per hour and will service a 10 diameter pond bottom nicely.
3 gravity flow bottom drains should optimally have a max flow rate of approximately 1800 gallons per hour and will service an 8 diameter pond b ottom nicely.
A bottom drain improves the water circulation and removes debris from the bottom of the pond reducing the maintenance of your pond.