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Formula to Calculate Evaporation Rate of Water in Reservoirs

Water is the most important natural resource that we have, especially in regions where rainfall is somewhat limited. In most Cities and Municipalities, water is stored in open reservoirs, but according to the United Nations Environment Programme (UNEP) on a global basis, more water evaporates from reservoirs than is consumed by humans.

Water evaporation loss can, for most reservoir owners and operators, turn into a direct expense. To estimate potential loss use chart below.

Liquid Loss Savings From
Water at These Temps (F)
With 4" Balls Evaporation
Loss in Quarts/ft2 h
Without Cover Evaporation Loss in Quarts/ft2 h
70
.05
.2
90
.14
.56
125
.49
1.96
160
1.28
5.12
Testing is per sq. ft. of open surface per hour.

Multiply numbers above by the actual open surface square footage of your reservoir for a more accurate determination of evaporation losses.

A water conservation and management program using conservation balls from XavierC LLC will drastically reduce the losses from water evaporation by 90%. Contact us today to find out what it takes to start saving with a XavierC LLC water conservation program.