Low humidity equals high evaporation that takes water out of your pool. Low rainfall also means that the water that is lost is not replaced. High wind can also affect the amount of water your pool loses by drawing moisture from the top of the pool out at a higher rate.
Covering the surface of water bodies with a fixed or floating covers considerably reduces evaporation losses. These covers reflect energy inputs from the atmosphere and create a layer that prevent transfer of water vapour to the atmosphere. Fixed covers have been used for small and medium storage.
How Much Should a Pool Evaporate in 24 Hours? On average, swimming pools lose about a quarter of an inch of water each day, yet variations in wind intensity, humidity and sunlight can drastically change water loss rates. Some of the strongest and most intense wind in the country can be found in mountainous regions.
Just because your pool is losing water doesn't necessarily mean that there is a leak. Natural water loss will occur because of evaporation, especially on sunny days. Heavy use will also cause water to leave the pool due to splashing and swimmers who are exiting the pool.
Losing more than ½” of pool water per day indicates you likely have a leak in your pool's structure or your pool pump system.
Pour an impermeable, floating liquid such as vegetable oil into the water. A thin layer of oil will float to the surface and prevent water molecules from making contact with the air.
Air pressure also affects evaporation. If air pressure is high on the surface of a body of water, then the water will not evaporate easily. The pressure pushing down on the water makes it difficult for water to escape into the atmosphere as vapor. Storms are often high-pressure systems that prevent evaporation.
How much water does my pool need to refill from evaporation? The average amount of water evaporation during the summer is approximately half of an inch loss per day. Multiplied by seven days, that's 3.5 inches per week. Use the calculation below to get a monthly estimate of the evaporation rate of your pool.
Eight hours is usually a minimum. In the dry season, water will need to be added to your pool each week. If you are adding more than 2″ of water/week, you probably have a leak. Pool leaks are pretty common; we detect and repair them every day.
Common Causes of Pool Evaporation
For example, high temperatures, lots of humidity, and high winds can increase your pool's evaporation rate. Pools without enclosures or tree cover will also evaporate faster than those with shade and protection because they are more exposed to the weather elements.
Place a bucket on the step of your pool, making sure the water level is the same both inside and outside the bucket. Mark the water level in the bucket and the pool water level on the outside. Wait 24–48 hours, then check the loss of both. If the pool loses more water than the bucket, then you have a leak.
The warm temperatures during the day heat your pool up, then the cooler temperatures at night cause the water to evaporate. This happens throughout the evening, until the sun comes out to warm the pool water again.
The Amount Of Chlorine
The concentration of chlorine in the water is one of the major factors that affect the rate of evaporation. The more chlorine the water contains, the faster it'll evaporate.
The average pool water evaporation rate is about a quarter of an inch of water per day or more than two inches in a week, which on a 33′ x 18′ swimming pool (an average pool size) is more than 2500 liters or approximately 600 gallons a week; this may vary depending on your climate and the factors listed above.
Evaporation occurs as long as the vapor pressure of the water is greater than the vapor pressure of the air. Therefore, evaporation will decrease as the relative humidity increases and will stop when the relative humidity reaches 100%.
Yes, just the heat alone can cause the pool water to evaporate. Regardless of whether or not the sun is out, if there is a significant difference between the outdoor temperature and the temperature of the pool, evaporation will occur.
Your pool level can fluctuate on an almost daily basis. Everything from evaporation and heavy rains to running your pool pump can affect your pool's water level. To keep your swimming pool water at the ideal level, it's a good idea to check your water level daily to ensure that the water level looks normal.
Knowing when to check for leaks is the first step. Changes in the ground around the pool such as boggy patches of grass, cracked tiles or obvious movement in the substrate around the pool may be due to a leak in the structure of the pool. Another sign of leakage can be found on a pool owners' water bill.
The most common places that pools leak are the areas where two different materials meet, such as near the skimmer, drains, or returns or at the tile line. Depending on your surface type, pools can also leak through cracks in the finish of the exposed aggregate, marcite or gunite of your pool.
The differential that occurs between the pool water temperature and the air temperature on late summer nights causes water to evaporate at an accelerated rate. In some cases you might see a water level difference of 1-3 inches overnight. Depending on the size of your pool, that can be over 500 gallons of water loss!
Is your swimming pool water level dropping? If it sinks below its optimal depth, you could face severe skimmer box damage. Due to the lack of water, your skimmer will start to draw air into the filter system. As a result, the motor for your pump is at risk of burning out.