To complete the Measure method you will need pond salt and a salinity meter. This method is the one for the scientist in all of us. If you use an outside company to perform this service, you can ask them to do this for you. If you didn’t get your metered number the first time around, you could get it when refilling a freshly cleaned pond. Some people completely drain and clean their ponds every year or two. You just need to make sure no one else at the residence uses any water during this period. Make note of the number at the start of pond filling and at the end and subtract the difference. Or if you forgot to pick up a meter, then you can always use your municipality’s street meter. Inexpensive meters like this are commonly available on many garden centers or big box stores. When first filling the pond put a meter on the garden hose to measure the exact number of gallons added. The meter method is the easiest and most accurate way to determine water volume, but it does take a little forethought. To assist with this method you can use our online calculator. But an overdose with an algaecide or a fish medication becomes a serious risk when using an estimated figure and this puts our beloved pond fish at risk. This estimate may be adequate for most needs choosing a pump, adding beneficial bacteria, etc. We can estimate the AVERAGE of each dimension to achieve an estimate of our pond volume. Rare is the pond with a perfect geometrical shape and a uniform depth so you can see this ends up being a guesstimate. In a rectangular pond with a uniform depth this would be Length x Width x Depth x 7.48=Gallons. With the math method we are simply finding the cubic footage of the pond and multiplying that by 7.48 (commonly rounded to 7.5) to yield gallons. This is the method most people use and can be fairly reliable as long as the shape and depth of the pond is simple and uniform. There are 3 ways to be able to determine the volume of water in the pond Math, Meter, & Measure. Guess work at the volume often proves sufficient enough, but can sometimes prove fatal to our finned little friends. If you are new to the world of water or someone with years of experience you should know quickly the volume of your pond is something you must know. We then find ourselves asking questions down the road when problems in the feature arise. Calculate the pond as a rectangle and the remove this percentage from the total surface area before multiplying by the depth.Many times when creating a feature we focus on the pump, the filter, the beauty. In the case of a kidney shaped pond you would form a rectangle around all outer perimeters and estimate a percentage of what is dry land. This value should be multiplied by 1000 to give a value in litres.Ĭomplex ponds such as kidney shapes will need to be closely estimated. The surface area is then multiplied by the pond depth to give the volume in m3. You will need to firstly work out the surface area of the pond by multiplying the radius by itself and then by Pi ( πr² ). Rectangular pond: 3m L x 1.5m W x 0.75m DĬircular ponds are calculated differently. The volume in m3 then needs to be multiplied by 1000 to give a measurement in litres. The simplest way to calculate your pond volume would be to work out the surface area in m2 (square metres) and then multiply it by the depth to produce m3 (cubic metres). Volume Calculator View our Pond Filters Wizard here. Below the calculator is a link to our Pond Filters Wizard which will automatically select the right filter for your pond, once you know the water volume. Most pond filter choices are based around Litres (not gallons) so make a note of your volume in Litres for future use. For circular ponds, calculate as a square, then reduce the pond volume stated by 20% (1/5th). For square and rectangular ponds and lakes, please use our simple volume calculator below.
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