Advice on pondless waterfalls
hi, everyone -- after much discussion, DH and I have decided that a pond is not for us, but we are considering a pondless waterfall feature in our garden. My googling has turned up many manufacturer/sales type sites touting this idea, but have any of you done this? Or know of sites with actual reviews/experience/warnings?
For example: does a pondless system need a bottom drain? How often do people have to clean theirs and how? I've seen the site for the filtrific system -- is that worth considering, instead of the gravel basin? how big a motor should I plan for (8 feet, maybe 9 feet long) and are some motors quieter than others?
Any thoughts, advice, or places to look for info would be very much appreciated! -- Linn