Pond Boss Forums INTRO Questions & Observations Question about water pressure

Thanks for the input, guys. I think that I am leaning towards not expanding. I would really like to have a larger pond, and the excavator is willing to trade work in exchange for leaving the black dirt that he excavated off the original dig for a longer time than originally negotiated, however, I really do not want to push my luck and be left with an empty hole.

Do guys possibly have any reference web pages you could point me in the direction of, that could further enhance my knowledge base on the subject? Thanks, again.