It would depend on where you where located. Beach is dramatically different than Desert.
Los Angeles Area "Low" Monthly ET is .97 in Jan, "High" Monthly ET 6.13 in July.
Divide by 4 to attain weely rates
Rate of evaporation depends on temperature. As Temp decreases, so does the rate of evaporation.
The rate of evaporation increases
The higher the temperature, the higher the rate of evaporation. It is
Heat speeds up the rate of evaporation.
Three factors that affect the rate of evaporation are temperature (higher temperature increases evaporation rate), humidity (lower humidity increases evaporation rate), and surface area (larger surface area increases evaporation rate).
if quality of water reduce the evaporation will decrase
The normal rate of evaporation is dependent on many factors. First, every type of molecule has a different rate of evaporation. For example, acetone has an evaporation rate of 3.0 while water has an evaporation rate of 0.3. You can find a complete listing of each molecule's evaporation rate at your local library. You can also find this information in most laboratories as well.
To calculate the evaporation rate of your swimming pool, you can use a simple formula: Evaporation Rate = (Pool surface area) x (Evaporation rate factor) x (Temperature difference). Measure the surface area of your pool, find the evaporation rate factor for your area, and determine the temperature difference between the pool water and the air. Multiply these values to calculate the evaporation rate.
the rate of evaporation will be equal to the rate of condensation
When air is cooled, the rate of evaporation decreases. Cool air has less capacity to hold moisture, which results in a slower evaporation rate. As the temperature decreases, the relative humidity of the air increases and the rate of evaporation slows down.
as the temperature increases, the rate of evaporation increases
A higher rate of evaporation has hot water.