Our community garden has a small preformed pond about 8 by 10 feet and about 30 inches deep. We have a small spillway that sits above and a pump. We want to make it more natural with river rock lining and a waterfall instead of just the spillway. We of course have limited funds but still want a retreat for our volunteers and visitors. We would love some help and always go to your site for ideas and use many of them in our garden.