So, we're talkin' a quarter million pounds of food??
The maximum depth is isn't the most important thing. The average depth is what matters.
Let's say the average depth is 25 feet. That's 1,500 acre-feet of water.
My pond is about 15 acre-feet at the very, very most. So let's say your coal mine pit is 100 times the water volume of my pond.
That would mean that the same question would be..."would 800 pounds of feed per year affect the water quality of Bruce's pond"?
The answer is "Yes, it would".
Does water flow out of this system in any way? Or is this purely a groundwater situation? I don't know much about coal mine/strip pit lakes, but I'd be concerned.
I guess another way to put it is "If 600 deer ran into your pit and died every year would it affect the water quality?" Or how about 8 full grown elephants? Four bulls and four cows.
Keep in mind that when an aquaculturist tells you that his fish are converting feed at 2:1, that's a dry weight to wet weight conversion. In reality, a fish is defacating 8 times as much waste as they are creating new muscle mass. A dry weight to dry weight conversion is something like 8:1.
