Yeah just check your water level. If you have an area where the water level is already really high, you can get away with just digging Otherwise you'll have to

Yeah just check your water level. If you have an area where the water level is already really high, you can get away with just digging Otherwise you'll have to add clay or use techniques like gleying. Or you can do it the easy way and use plastic like in the video. Just make sure it's not biodegradable plastic. That'd be the fastest route to a microplastic polluted pond you can take