I have no experience with Pondless, but I am a big fan of my stream. I would expect others to want to know a couple basic questions that you didn't cover. Are you looking for 'raging waters' or are you after a gentle natural stream? What do you have against a pond? You are taking up a similar space for your resevour. What is going over that area since it is not a pond? Do you already have a pump; size?

We actually have a pond as well. This is separate from the pond. We are looks for gentle roll. I don't have the pump size handy but my local pond store sized it for our needs. Over the reservoir would be rocks and probably a decorative piece (statue or something). The concern is people walking on it. Aqua bloc can hold the weight but I don't want to spend that kind of money. I don't want to fill with boulders or large rocks as we would lose the water space. The reservoir is completely separate from the pond. Does that help?