Often, people do not realize how much water can evaporate from a pond during the dog days of summer.

For a pond to lose ½” – 3/4” of water per day under certain conditions is not terribly uncommon and probably no cause for alarm.

The amount of water evaporating will depend on several factors including; cloud-cover, shade over the pond, humidity, wind, and the specifics of the waterfall or fountain. The longer a stream, the more water is exposed to the air, greatly increasing evaporation.