Rowly, as you know I have had ducks on my pond for some years. I have avoided problems because of the massive flushing of the pond that occurs in the winter months here. Our rainy season produces a great runoff and probably runs 4 or 5 times the water quantity of the pond through it and down the spillway. As it does so, it creates a good deal of turbulance. I have measured flows of up to 300,000 gallons a day through a 2 surface acre pond! I think this is the primary reason that my pond's water quality has stayed pretty consistant. Without this flushing, I could easily see how a problem could occur as some of the guys have noted. Having said all of this, the Bobcats have eliminated my last "free" ducks so I have no worries on any account.
Jim
