I’ve been thinking about redoing my current pond to add 1 or 2 bottom drain to it. Good thing with my pond set up is that it is a raised wooden pond and I can either increase the dimensions of the pond by adding 4 more layers for 4x4s to make my pond 12 feet by 6 feet by 3 feet which is about 1700 gallons. This would be the expensive route.
The other option is just simply buying another pond liner and laying it on top of the current pond liner after putting sand or dirt in between to make sure the the lowest part of the pond will be in the middle and installing a retrofit bottom drain.
The third option and cheapest is adding a retrofit bottom drain to the current lowest part of my pond which is on the edge of the pond and sweeping all the koi waste into it.
I did draw up some drafts for the expensive setup with an rdf.
Any recommendations?