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.
Diy bottom drain for koi pond.
Pour concrete in area around bottom drain and contour as per the following drawing.
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.
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 the rubber collar over the liner and pipe.
Bottom drains you should fit your bottom drains while the pond is under construction.
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.
This is before you pour the concrete into the base.
Install the bottom drain bulkhead fitting 1 below the pond bottom surface.
For liner ponds remove dirt around bottom drain pipe 6 deep with at least a 9 radius.
Cut a hole in the middle of the pipe the diameter of the pipe 4 pipe.
Place a bead of silicone around the pipe s outer perimeter.
Fold the liner over the pipe like a paper towel over a drinking glass.