Originally Posted By: liquidsquid
I would guess a very large change in water quality, then a bunch of swings in PH. For the same reasons you shouldn't change more than 50% of water in an aquarium at a time, ever. A number of things can happen with this much water exchange that will stress fish:
Large Ph swings
Large Temperature swings
Large die back of phytoplankton adding to the problems.
Large change in alkalinity and salts.

That is a heck of a lot of rain. If we had that here in the hills, it would be an unprecedented disaster of biblical proportions. The fish in my pond would be the least of my worries.

Thanks for the reply,
The rain did cause quite a few problems in our area just not at my house. I am on the high end of town. Typically the close one is to the Mississippi the better off you are around here flood wise.
Well all of those things might have occurred. I need to check my pH on a regular basis just to get a baseline. The well I normally keep my pond full with is on the salty side. That much fresh rain water probably did cause a pretty big alkalinity and salt change. I also noticed that the water in my pond got relatively clear compared to normal after the cloudiness went away. Might have been the phytoplankton kill you mention. Just noticed today my pond is now very green. The other change that could have brought on that you mention is I used to have to add a whole lot of the salty well water to keep the pond full. Now it's staying pretty full, I think the ESS13 might be working so that will also change everything. Maybe all of that well water helped to stabilize the water quality. Besides pH I can also run alkalinity at work to get a baseline. Well now my baseline might have changed. significantly from what it was before.

Last edited by DonC347; 07/09/14 06:46 PM.