I don't know about evap. in your area, but down here we can lose as much as an inch a day in the heat of the summer. Thankfully, we've had a tropical spring this year. My pond has maintained almost full pool so far, knock on wood, for the first time since I was a kid, or so I've been told. This is the fullest that I've seen since I've been back these past few years. I hope that it works out for you, and at least you have the option of pumping from a near by stream. Around here,if you get caught using a pump for any reason, the water police will come and get you.

Orbis Non Sufficit
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