Smoke on the water. When the pool water temperature is warmer than the air temperature and the air is dry, the evaporation rate is very high. This occurs in the fall when we have warm days and cool nights. You can see in this photo the steam raising up through the leaf cover. The day time temp. was 70 degrees and the night temp. was 35 degrees.
If you are in doubt about the evaporation rate you can do a bucket test. To learn more vist our web site npsleakdetection.com and click on about leaks.