How to Calculate

How to Calculate Water Volume 7.48 gallons per cubic foot. 1 cubic foot = 7.48 gallons. 1' Length x 1' width x 1' depth = 1 cubic foot Cubic feet are measurements of Volume It is best to use a water meter when filling your water feature for the first time to obtain an accurate number of gallons that you pond contains. But there are several other ways to obtain the number of gallons in your water feature. All water features can be broken down into one or more of these shape categories. Volume Calculations for each shape is listed for you below. For "odd-shaped" water features, simply break down the water feature into smaller categories that fit into the shapes listed below - then add them all together for a close approximation of volume and gallons. For multiple, or variable depths - use an "Average Depth" measurement in the Depth calculations below. Volume of a Rectangle Volume of a Square Volume of a Triangle Volume of an Ellipse or Oval Volume of a Circle or Cylinder Volume of a Half Circle Volume of a Quarter Circle Volume of a Circle Section (Pizza Slice) Volume of a Trapezoid Caluclating Pond Volume Using Salt ( non iodized salt) You can NOT use Proform C if you use this salt method Salt Method: An alternative method to calculate pond volume is accomplished by adding a known weight of salt and testing for salt concentration (salinity) change. This method requires an accurate salt test kit* as follows: 1. Test a pond water sample for salt following the instructions of your test kit. Record this concentration in percent. For our purposes let’s say it is 0.05%. 2. Add 1 pound of salt per estimated 125 gallons of pond volume. Let’s say we believe our pond is 5000 gallons so we add 40 pounds of salt. 3. Wait until all salt has dissolved plus two hours. 4. Test a pond water sample for the new salt concentration. Let’s say the new concentration is 0.15 % giving us an increased salinity of 0.10% 5. Calculate the pond volume using this formula: ( P / T ) x 12 = V V= pond volume in gallons P = pounds of salt added T = actual concentration CHANGE in % (or change in /10) Example Calculation = (40lbs/(1 PPTchange/10)) X 12 = 4800 gallons OR = (40lbs/0.1 % change) X 12 = 4800gallons