![]() ![]() You can accomplish this in three basic steps: measure water’s salinity, add salt and measure again. The best way to calculate water volume in an existing pond is to use dissolved salt measurements. For example, a pond that is 20 feet in diameter and 5 feet deep would be calculated as 3.14 x 10 x 10 x 5 = 1,570 x 7.8 = 12,246 gallons. Multiplied by 7.8, this rectangular pond’s estimated water volume is 11,220 gallons.Ĭircular Formula (feet) = (3.14 x radius x radius) x depth = Volume in cubic feet X 7.48 = gallons. For example, a pond that is 20 x 15 x 5 would have 1,500 cubic feet. Rectangular/Square Formula (feet) = length x width x depth = volume in Cubic Feet X 7.48 = gallons. You need to then multiply by 7.48 to convert feet to gallons. However, estimating volume is the first step in other methods needed to obtain better measurements.Įstimating water volume involves determining what geometric shape your pond best resembles and then performing a simple calculation to determine the volume in cubic feet. Even mild depth variation, or small contours on the pond’s sides, will produce inaccurate results using this method. The estimation method will only yield accurate results if your pond is a perfect geometric shape (e.g., square, circle, or rectangle) and has flat sides and flat bottoms. ![]() If you have a sizable pond, you might easily spend several hours filling it. Even with a 3/4 inch garden hose, which flows about 12 gallons on average per minute, it would take about an hour to flow 720 gallons. The downside of this option is that it is time-intensive. If your meter reads cubic feet, you will need to multiply that number by 7.48 to convert to gallons. Subtract the ending number on the meter from the beginning number. To obtain a water meter reading, you simply need to note the beginning number on the meter, fill the pond and note the number when the pond and filter systems are full. These all will impact the total water volume in your pond. Use a high-quality meter and set your pond up with everything non-living that it will have once the fish are in it–plumbing, filtration, and water features, etc. If you have an existing pond already stocked, this method won’t work unless you drain it and provide temporary housing for inhabitants. You need to do this before placing any fish or plants in the pond. If you are in the pond construction process, the most straightforward way to calculate how much water fills a pond is to measure the volume using a water meter. ![]() The three most common methods to calculate how much water is in your pond are water meter, volume estimate, and salt/salinity. Several natural and mechanical options exist for maintaining healthy oxygen levels in your pond, and the pond’s volume will dictate the extent of the measures needed. Oxygen levels should be at a minimum of 5.0 mg/L for koi. If you install a filter that doesn’t meet your pond’s needs, your water quality might suffer.Īeration is also vital to maintaining a pond with thriving koi, and the larger the volume, the more aeration it needs. Pond water needs to circulate through the filter approximately once every hour, which means that the size of your filter should correspond to the pond’s volume in gallons. An overcrowded pond can lead to aggressive behavior, poor water quality, and sick and unhappy fish. Your pond needs to hold at least 1,000 gallons to start, plus 200 gallons for each koi. The desire for more koi and goldfish is inevitable, but your pond needs to stay within healthy limits for your living jewels. Overstocking is one of the most common problems pond owners face. Knowing the correct number of gallons your pond holds is key to informing stocking capacity, planning equipment needs, performing water treatments, and installing water features. Obtaining an accurate measurement of your pond’s volume is helpful for anyone keeping koi. ![]()
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