I'm in the blackland prairie region of Texas. The soil here is alkaline so I would presume the pH of ponds and lakes in this area is high. Limestone is abundant in this area so we should have decent buffering capacity. However, ponds are so low right now that a sudden inflow is almost certain to drop pH. I've seen a couple of fish kills occur in this area when drawn-down ponds fill suddenly. I'm not sure what sort of shock is the culprit but I'm definitely wary of a major rainfall event right now.
