Creating a spring w/ watercress
Now kinda thinking of having one or maybe both of my exit tubes go to the back (behind the small curved wall you see in the pick) where I want to create a spring like effect where water bubbles up from the rocks in a shallow basin about 2 ft wide and 6 feet long and then goes down a slight incline through openings in the rock wall back into the pond in a trickly springlike kind of way, vs a noisy mountain stream. I want to grow watercress and that would be a good place for it.
Questions: would it work to drill holes in the tubing after it gets to the basin and then pile rocks over it ? Not a thick layer of them - about 6 inches. Or should I treat it more like a stream (I guess it sort of is) with one tube discharging at the highest point in the basin?
I know the noisy mountain stream is best for aeration of water. Well, could I compensate to some extent by turning over the water more frequently - maybe even as much as 2 x per hour? I just really like that soft gurgly trickly sound more than the gusher I now have.
Re plants - does water cress and/or marsh marigold survive the winter in solid ice? I think Id rather shut down the pond and move fish inside as Ive been doing.