Cope with

Waterproofing is necessary, because otherwise all the water will be absorbed into the ground, and all the time will go there, no matter how much the pond is filled with new portions of water. You can cope with this task with your own. You can use different technologies and materials for this. The cheapest and simplest way is to use PVC film. It just needs to be laid on the bottom and fix the edges with something heavy along the shores. Then you can decorate the shores so that it looks neat. In your free time, you can find out how the manufacture of non -standard doors is carried out.