Pond Boss Forums STOCKING A NEW POND Types of fish to choose pond evaporation rates using subsurface aeration?

Gonna have a dry year in my neck of the woods (E Central Ia.) I run a subsurface diffuser 24/7 that creates significant surface bubbling in an acre surface pond. Will I create substantial evaporation over and above normal atmospheric conditions using this? Would running it only at night help? Thanks-Postbeetle

Let's think this out. Evaporation is liquid water turning into vapor and moving into the air. Evaporation is increased by 1) increasing water temperature at the air interface (your aeration would mix warm upper and cool lower water levels, lowering the temperature at the surface), 2) increasing the surface area of the interface (the hump of the boil does this so slightly as to be negligeable), 3) moving more air over the interface so that the relative humidity/partial pressure of water vapor in the air at the interface stays low (your aeration moves water to the interface, not air). Did I miss anything?

The biggest increase I can see is that the air going into the airstone/diffuser will come out of the pond pretty saturated with water vapor - but that volume of air is very small compared to all the air over the area of the pond. I think that aeration would increase your evaporation rate too little to notice.

This is the point where if I'me really, really wrong, a true expert will set you straight, make me look foolish (very politely) and we'll both learn how it actually works.

I am guessing aeration will increase evaporation because of #3 Theo. But rather than moving more air over the interface you are moving the interface more, hence increasing evaporation rate. I may be wrong also, but I think anytime you are aerating you are increasing interface/air interaction therefore increasing evaporation. BUT, I think this would not be a substantial amount.