In determining the amount of product necessary in treating your pond it is important for us to be clear on a couple of things: the current vertical loss in 24 hr, and the slope angle of the pond. This page will help to make sure that we are all referring to the same measurements.
In measuring the 24 hr vertical loss it is useful to use a steel ruler or staff gauge that is driven into the ground in an area of the pond that is easily accessible. The pond should have water in this area for the entire 24 hr period as well. Simply note the elevation on the ruler at the start of the test and return the next day to determine the new elevation.
Pond evaporation can be calculated using a bucket (pail) that is completely full of water and placed in a level location directly next to or within a shallow area of the pond. Fill the bucket as near to the top as possible without allowing it to spill over. Note the water level. Re-measure 24 hours later. It is important that the bucket be re-filled after each 24 hour reading. This process should be repeated daily for three days.
There will be additional evaporative losses from water that is absorbed into the soil at the water's edge. This is called wicking or capillary action. Multiply the evaporation from the bucket by 50% to calculate this evaporative loss and add to the evaporative loss in the bucket. This total evaporation amount will closely approximate your pond’s evaporation rate and should be subtracted from the “gross” total loss amount. The remainder will be credited as “net” pond loss (seepage).
Slope is determined by measuring the length of the slope and the depth of the pond. It is usually expressed as Length : Depth (ie. 4:1, 2:1, 1:1, etc.)
For more information, or to tell us about your project, please contact us today!