Would allowing the cows access to the pond be causing most of my problem? I have 10 cow/calves and they seem to be in the water when they are in that pasture. I am pretty sure that when it rains, I get manure runoff in the pond. Should I keep them out of the pasture with the pond? They have other pastures with water troughs they can stay in, they just like to stand in the pond and cool off as far as I can tell.