Swimming Pools
Evaporation and Condensation

What is the evaporation rate of an outdoor pool in Florida?

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Wiki User
2010-01-12 23:26:25


Evaporation rates vary depending on many factors such as relative

humidity, air temp, water temp, and wind speed. Also running water

features such as spitters, water falls, sheer decents greatly

increase the surface area of water increasing the amount of

evaporation. The swimming pool construction company I work for

considers 1/8 in. water loss per day normal evaporation. Pools that

run multiple water features for extended periods of time may lose

upwards of 1/4 in. per day.

The evaporation rates of occupied and unoccupied swimming pools

have been measured to derive empirical equations for calculating

loss. Three references are:

1. Smith, Charles C., George O.C. Lof, Randy W. Jones, "Rates of

Evaporation from Swimming Pools in Active Use", ASHRAE

Transactions, Volume 104, 1998

2. Smith, Charles C., George O.C. Lof, Randy W. Jones,

"Measurement and Analysis of Evaporation from an Inactive Outdoor

Swimming Pool", Solar Energy, Vol. 53, No. 1, pp. 3-7, 1994

3. Shah, Mohammed, "Calculating Evaporation Rates from Indoor

Water Pools", HPAC Engineering, March 2004

A spreadsheet tool for estimating the heat loss due to

evaporation from an indoor pool is available at


This tool is based on the reference above by Shah.

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