Here is how I did mine... simple steps.
1- Next to the pond I decided where the bog to pond waterfall will be and removed the stones.
2- I dug 6 inches down in the shape of a rectangle, feel free to make a different shape. Make it 1/3 of the area of your pond.
3- I bought bricks from lowes and lined them up around the dug area and I ran a line of industrial glue on them and then put more bricks till I had 3 layers...
4- I bought a liner and an underline and covered the area then I placed bricks on the liner area cover my bricks surrounding the dug up area.
5- I made a pvc pipe into branches to fit the area and connected it to a hose that is connected a small solid accepting pump in the pond.
6- I filled the area with pea gravel 3/8" and put plants.
tada!!! See addys post for details...