I have acquired a 1/4 acre pond, 12' deep, very little shallow area. It is pretty much stagnant, accept for run off. That goes over the bank, to a creek. I also believe there may be a small spring in it, the water level stays pretty consistent. I plan on installing a waterfall for aeration and circulation. And possibly pumping water from the creek, for more circulation. I'm told there are bass and blue gill, and maybe catfish. I would like to stock yellow perch. Before I do that, I want to expand, by digging out a shallow area for spawning. After all of this, my question is. Can I push dirt and vegetation into the pond to add a couple feet to the bottom?