Collecting Data for a Bathymetric MapĪ bathymetric map is generated by using an acoustic sounding device linked with global positioning systems (GPS). They can also help check the before-and-after of a dredging project. A bathymetric map calculates the depths of a given pond or lake, which can then be used for various applications.īathymetric maps are often used for comparisons of how a body of water has changed in depth and sediment accumulation between two points in time. By its simplest definition, bathymetry is the measurement of the depth of a body of water. To get the most precise measurement of volume, bathymetry can be used. Using Bathymetric Mapping for Precision Pond Measurement Using the examples above, a 0.5 acre pond with an average depth of 4 feet would be 2 acre-feet or 651,702 gallons. One acre-foot of water is 325,851 gallons, and so you multiply your acre-feet (AF) by 325,851 to get your volume. This metric can now be converted to calculate pond volume. By multiplying these together, you get the acre-feet for your pond. Now you have the acreage and average depth. So, if your pond’s deepest point is 8 feet, the average depth would be 4 feet. A quick and fairly accurate way to get your average depth is to measure the deepest point in your pond and divide it by two. Once you have your pond’s acreage calculated, you need to find the average depth of your pond. There is a function that allows you to simply outline your pond from above and receive the acreage. For example, if your pond measures 21,780 ft ², it would be 0.5 acres.Īnother method that is readily accessible and very accurate is to download Google Earth on your computer. One acre is 43,560 ft ², and so you divide your pond’s square footage by 43,560. Once you know the area of your pond in square feet, you need to calculate the acres. These methods can give you a relatively accurate way of calculating the area of your pond. If you record all of the measurements in feet, then the calculated area would be in square feet (ft ² ) going forward. You would then use this formula: Area=½ bh. Then from your base, determine the height (h), or distance, from the line of the base to the opposite “point” of the triangular pond to determine metrics for the formula. įor triangular pond volume, pick one straight side as the base (b) and measure that distance. įor a square or rectangular pond, you would measure the length (l) and width (w) and use the formula: Area=lw. The radius ( r ) is half the diameter, and you then use the multiplication formula: Area=πr². ![]() For example, if your pond is round or circular, you can measure the “length” of your pond from one end to the other to find the diameter. Look at the general shape of your pond to select the right calculation for the area. You can use a tape measure, measuring wheel or even a rangefinder to perform the measurements. Measuring Pond Areaįirst, you’ll need to measure the area of your pond, which can be determined by measuring distances around the perimeter of your pond. Below, we’ve provided a makeshift pond volume calculator with a few methods and pond volume formulas you can use to gather the data yourself. To calculate the volume of a pond, you must know the acreage of your pond and the average depth. If the treatment is too small, it won’t have any effect, but if you add too much, it could harm the fish and other organisms found in the body of water. You’ll understand how much herbicide product is enough to treat the water inside the pond. Why should I measure the volume of my pond?ĭetermining the size of your pond is essential in proper vegetation control. The closest answer is calculated based on a few parameters, including acreage and depth. ![]() How much water is actually contained in a pond seems like a very simple question.
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