Cut a hole in the middle of the pipe the diameter of the pipe 4 pipe.
Diy bottom drain for koi pond.
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.
For liner ponds remove dirt around bottom drain pipe 6 deep with at least a 9 radius.
Bottom drains you should fit your bottom drains while the pond is under construction.
Place a bead of silicone around the pipe s outer perimeter.
Bottom drains are considered a necessity in koi ponds or water gardens greater than 1 000 gallons where water quality and clarity are considered important.
A bottom drain improves the water circulation and removes debris from the bottom of the pond reducing the maintenance of your pond.
This is before you pour the concrete into the base.
Pour concrete in area around bottom drain and contour as per the following drawing.
Think of a koi pond as a swimming pool for koi.
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.
Let the concrete dry install liner and then place drain cover on liner over pipe opening.
Place the rubber collar over the liner and pipe.