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Thread: Evaporation

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    What is "normal" amount of water that you may expect to evaporate out of your pool per day. I know various weather factors influence it, and I also had a pool person tell me that you get more evaporation at night than the daytime. Is that correct?
    14,500 gal pool
    Intellichlor Salt Generator
    Water Fall

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    mas985's Avatar
    Join Date
    May 2007
    Pleasanton, CA

    Re: Evaporation

    What seems to be the biggest factor in evaporation is the temperature difference between the pool water and the air. Because I have solar, my water is quite warm but where I live the nights are cool even sometimes in the summer. So worst case, I have seen close to 3" per week in water loss. But for my area, the average annual evaporation is 60" or a little over 1" per week. It is typical to get twice the annual average for summer time and up the 3x if you have solar like I do. You can look up your area here.

    So depending on the air temp at night, evaporation can be worse then which is why a solar cover is helpful to maintain heat. Evaporation will occur during the day as well but because the air temp is higher, it is less than at night. But wind plays a big factor as well.
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater, ThePoolCleaner

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