A general rule to follow is that most water features will lose about 1 inch per week from evaporation.

Any time you splash water in the air there will be some type of evaporation. How much depends on many factors including:

· Difference between air and water temperature

· Wind

· Sun vs clouds

· Fall (height of pattern)

· Droplet size and more…..

All decorative discount-pumps.biz/pond-lake-aerators.php pond aerators or discount-pumps.biz/floating-fountains.htm pond fountains that splash at the surface will have the most evaporation. Surface aerators that just bubble and circulate will give the lowest percentage of evaporation per (gallons per minute)

Now we have to add some real variable into the equation, this is the “splash factor” in the stream bed and also the waterfall. If it is a very hot summer day and the water is splashing small droplets onto a hot rocks, it will immediately evaporate rather than run back into the stream. Some, naturally, may actually splash completely out of the stream bed. And, do not forget the occasional deer or other animal drinking at night, or neighborhood kids playing, or the large dog taking a swim and taking water out with him.

Surface Area / Volume

You need to figure the square feet of surface area in your pond.  Take the Length X Width of the pond if square or rectangular, or Length X Width X .85 if irregular shaped.

Example: A 7’ X 11’ pond

Rectangular Pond: 7 X 11 = 77 sq. ft. of surface area

Irregular Shaped Pond: 7 X 11 X .85 = 65 sq. ft. of surface area

You then take the sq. ft. and multiply it by .62 this will give you the number of gallons you have in 1 Inch of your pond.

So an irregular shaped 7 X 11 Pond would have 7 X 11 X .85 = 65 Sq. Ft. X .62 = 40 Gallons per Inch of water.

So if we take the numbers in the examples above and assume we have a sheltered pond and are pumping 1000 gallons per hour we should be losing around 5 Gallons per day to evaporation.  If you multiply that by 7 (5 X 7) you get 35 Gallons lost to evaporation per week.  That compared to how many gallons are in an inch of water 40 Gallons (from the example) you can see you would be losing about 1 Inch of water per week to evaporation.

To be exact, divide Gallons Lost Per Week by Gallons In 1 Inch of Water: 35 / 40 = .875 Inches per week of evaporation.

Also, a hot day with low humidity will obviously have a different evaporation rate compared with a cold and damp day. All of these variables play a role in the evaporation rate. For more help and tips check out our home page discount-pumps.biz/index.php Discount Pumps.