Is horizontal drilling a thing for water wells? I think it would be pretty neat to basically create you're own spring but most of the search results I saw for horizontal drilling were for petroleum.
Yes, everything I have seen regarding "horizontal wells" or "horizontal drilling" has referred to oil exploration. However, it seems pretty logical that if you have water underground high up on a hill that is higher than where you want the pond, you could drill horizontally to it to feed the pond. It would then be easy from there to have it flow for a bit before entering the pond, and therefore aerate itself and create good trout-spawning habitat!