Have you considered two pumps? One on either side. The type of pumps we are discussing aren't really great for providing a high velocity sediment moving type flow. The stream type pumps are good for providing high volume low velocity/pressure type flow. They are great pumps for moving a lot of water, but lack the flow intensity relative to other styles of pumps. Of course with that said, you could get a larger modeled of the above discussed pumps and probably achieve what you want. Its a matter of balancing size/function.

You may be better off with a maxijet 1200 (or similar).