I used to have a fish pond but I just got tired of all the maintenance. I now have a pondless waterfall and would never go back to a standard pond. Mine has been running for three years with no problems. My waterfall is 5 feet high and the stream is around 6 inches wide where it flows out of the rocks. I have a pump I purchased from Home Depot that was rated for 850 gpm and it has plenty of volume to keep the stream flowing. You will definetely need some sort of burried container to set the pump in and hold all the water in the system when you shut it off. I buried a 55 gallon drum and my stream runs into it. Good luck.