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Water Evaporation from a Pool

The evaporation rate depends on the surface area of the pool, the temperature, and the relative humidity and the wind. I'm sure an "equation" containing the variables is known. Perhaps a civil or mechanical engineer would have a specific equation. I did find what seems to be a credible source that provides a reasonable answer. Here is the link: Marin municipal water district. They have a chart that lists 200-300 gallons per week for a medium-sized pool -- about 2%-5% of typical pool volumes. "Splash-out" water is probably a much more significant source of water loss.

Here are more opinions and answers:

  • In my 14 years of experience, I found that there are a lot of circumstances involved in how much water is lost during evaporation. The best way to find out how much water your pool is losing is the following:

    Take a 5-gallon bucket and make a mark with a permanent marker at about the halfway point. Fill the bucket with water up to that point, and set the bucket right beside your swimming pool. Simultaneously, use a pencil to mark the water level on your pool tile. In that way, your can determine how much water has evaporated from the bucket and from the pool.

  • The evaporation rate of water from a swimming pool is fairly easy to calculate; given you have access to a psychometric chart or a water vapor tables. W=(A (69.4+30.8 (V)) / Y )(Pw-Pa) W = lb / hr of evaporation. A = surface area of the swimming pool. V = mean wind velocity (mph). Y= Latent heat (approx. 1000). Pw - Sat. Press at Room Air temp (in Hg). Pa - Sat. Vapor press at water temp (in Hg)
  • Wow! Who has enough time on their hands to run complicated math formulas. A simple rule of thumb in the pool industry is that 1/2" to 1" per day is normal evaporation. Evaporation more than 1" per day would indicate a considerable amount of splash-out or a water leak.
  • The above answer is completely incorrect!! I have worked in the pool industry for over 30 years, and I am currently a leak detection professional who teaches my craft at the swimming pool convention. I am also a founder of an international alliance of swimming pool leak specialists. 1/2" to 1" per day is not a general rule of thumb in the pool industry and is excessive! Use a bucket of water set next to your pool to determine how much water evaporates in your area. Even two pools at neighboring properties can have different evaporation rates due to differing environments.
  • In different areas the rate of loss varies, but in Houston, Texas, we figure on evaporation of 1" to 1.5" per week during the summer.
  • Some people don't realize that water evaporation is much greater in the fall than in the summer -- when water temperatures are high and air temperatures are cold (especially at night). This will just suck the water right out of the pool.

    I am sure there are a lot of variables regarding geographic location and humidity levels. In the Mid-Atlantic, I would consider anything over 1/2" per day the mark to start looking for problems (unless you have a heated spa or waterfall, etc.).

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12y ago
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15y ago

What size is the pool? Where do you live? How much average rainfall do you get? How hot is the area? I live in South LA. We haven't received any rain here in the month of June. I'm having to constantly add water to keep the level above the skimmer line. It takes an hour to two hours to simply add an inch of water back to my pool. What a water bill!

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4y ago

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Q: How much water evaporates from a pool?
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Related questions

How much water evaporates from the pool?

This depends on many factors.


How much water evaporates from a pool in winter?

nearly none but most of the water might freeze.


How much water evaporates from a pool 4413.72 square meters?

If you wait long enough, all of it!


Why do you always have to add water to your pool?

You need to replace the water that evaporates.


How much water evaporates from a pool in the winter?

The amount of water that evaporates from a pool in the winter depends on factors such as temperature, humidity, and wind speed. Generally, water evaporation is lower in the winter due to cooler temperatures and decreased sunlight. It is important to monitor and adjust water levels as needed to prevent damage to the pool equipment.


Can salt evaporate with pool water?

Yes, salt can evaporate with pool water. As pool water evaporates, the salt content remains in the pool. When the water evaporates, the salt will be left behind and may accumulate in the pool. Regular testing and monitoring of the pool water chemistry is important to maintain the proper salt levels.


How much water evaporates from a pool in Phoenix?

Eventually, all of it if not replenished. The rate of evaporation depends on local climatic conditions.


Which mineral can form when a large pool of water slowly evaporates?

This depends on the solute in water.


As ocean water in a tide pool warms and evaporates the remaining water becomes?

saltier


How much water evaporates from pool with cover on?

Water evaporation from a pool with a cover on is greatly reduced compared to a pool without a cover. The cover helps to create a barrier that prevents evaporation caused by wind and sunlight. The reduction in evaporation can be as much as 90% with a cover on.


Why is your water level in your pool dropping over night?

Water evaporates. The hotter the surface temperature is, the faster the evaporation rate it. Even during the summer, the water evaporates at night.


What evaporates the slowest salt water distilled water pool water or faucet water?

Distilled water evaporates the slowest among the three options, followed by pool water, and then salt water. This is because distilled water contains no impurities that could hinder evaporation, while pool water and salt water contain dissolved minerals and salts that can slow down the evaporation process.