# Calculating Swimming Pool Evaporation

Calculating Swimming Pool Evaporation

Every swimming pool experiences water evaporation. The rate of this evaporation depends on many factors including air temperature and humidity. When left untreated, water evaporation can lead to low water levels in your swimming pool, eventually burning out your pool pump. To avoid costly repairs and also maintain the proper chemical balance in your swimming pool, it is extremely important to maintain the water level. To accomplish this, you must first figure out how much water is evaporating by measuring the water evaporation rate over a period of one week. This way you can easily counter the effects of excessive evaporation and ensure that your swimming pool equipment continues to work efficiently. Let’s take a closer look at how to properly calculate swimming pool evaporation.

• Using a ruler, measure the distance from the top edge of the swimming pool to the water line. Record the measurement in a notebook, making sure that you date the entry.
• Do not add any water to the swimming pool for one week.
• After one week, take the measurement again, recording it in your notebook.
• Subtract the second measurement from the first and divide the result by twelve. Record this result.
• You will need to determine the surface area of the swimming pool now. For a rectangular swimming pool, multiply the width by the length of the pool. For a round swimming pool, multiply the diameter (across the middle of the pool) by 3.14. Record the surface area of the swimming pool in your notebook.
• Multiply the surface area of your swimming pool by the final evaporation result recorded. The result is the evaporation rate of your swimming pool expressed in cubic feet.
• Multiply the evaporation rate by 7.48 to determine how many gallons of water your swimming pool loses in on week. This is the amount of water that you must add to your swimming pool each week to maintain the proper water level.

Some tips to remember:

• The water level in your swimming pool should never be so low that the intake at the top of the pool sucks air.
• Calculating how any gallons you add to your swimming pool each week will help you determine if your water bill is correct, or if you have a leak somewhere else.
• If your swimming pool loses an excessive amount of water, the swimming pool filtration system might have a leak. Check the seals and gaskets to ensure that they aren’t leaking. If no leaks are visible in the above ground equipment, a professional should be consulted to locate underground leaks.

Fluid Pool Designs works with both pool builders and homeowners providing only the highest quality swimming pool services. We service all areas of Orange County, Riverside County and Los Angeles County. Please contact us today for a free swimming pool consultation.