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Message: [QUOTE="MitchM, post: 344615, member: 4402"] 1 inch of water loss in your pond is about 177 gallons. With the conditions you posted, I came up with a wide variation, between 5 and 15 gallons per day loss calculated. Different wind speed, air and water temperatures can make a big difference. Aeration is also a factor to take into consideration, and I found this paper on the effects of evaporation on a pond. [URL='https://research-repository.griffith.edu.au/bitstream/handle/10072/46754/78054_1.pdf%3bsequence=1']https://research-repository.griffith.edu.au/bitstream/handle/10072/46754/78054_1.pdf;sequence=1[/URL] I haven't gone through the paper yet. I'm sure a waterfall and/or stream design will also increase evaporation. Using the pan evaporation rate for your state for the month of June, you should be losing only about 45 gallons per day. I found monthly pan evaporation rates here: [URL]http://large.stanford.edu/courses/2010/ph240/harting2/docs/NWS34EvapTables.pdf[/URL] I'll have to go through the original paper I posted for this thread and have a look at what the water body was that they used for the study. I imagine it was a still pond. Thanks [/QUOTE]