If you aren't aerating now, adding an aeration system will increase the oxygen level in the existing water, which will become critical as the water decreases (more fish per gallon of water remaining). You might avoid a fish kill with an aerator. I jammed all my fish from a 1/3 ac pond into about a 1/20th acre pond while I was renovating my pond. The water had a couple of inch visibility due to the sediment that was stirred up, but I only lost one 9" BG during the 4 month renovation.

I realize that adding an aeration system to a BOW that might dry up may sound silly, but it all depends on how many fish you have in the pond, and how much of a gambler you are. It won't help at all if you run out of water!

I just had Sue Cruz of Vertex Water Features map out a system for a pond. Give them a call and talk. It can't hurt!

www.hoosierpondpros.com

[Linked Image from lh6.ggpht.com]
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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).