# FREE Aerator Help

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### SIZE

Some numbers to know include the length, width, and acreage. Rectangular ponds are easiest to measure, but you can figure out these numbers for a circular, triangular, or odd-shaped pond too. Pace off (one step is about 3 feet) or use a measuring tape to get the numbers you need and them plug them into one of these formulas:

• Square/rectangle – Calculate the length and width; L x W = surface area
• Circle – Calculate radius (1/2 of the pond length); Pi x R2 or 3.14 x R x R = surface area
• Triangle – Calculate the base and height; (0.5 x B) X H = surface area
• Odd-shaped – Measure your pond in sections using the calculations above or use a handy online tool like Bing Maps. To determine how many acres your pond is, divide your value for surface area by 43,560 (the number of square feet per acre)

### DEPTH

Diffusers placed in deeper depths are more efficient at aerating a pond; so understanding your pond depth is important to make sure you correctly size an aeration system. If you do not know your depth or think that it may have changed over the years, it is time to familiarize yourself with the bottom of your pond. Start by grabbing a string marked in 1-foot intervals, a weight (like a brick), a notepad & pencil, and a boat or canoe. Then, head out to the pond and follow these directions:

1. Securely attach the weight to one end of the string.
2. Take your boat or canoe into the pond with your materials in hand and travel towards the center of the pond.
3. Drop the weighted string into the pond and note where it hit bottom. Repeat in at least four other locations in the pond, more if your pond is particularly large, so that you have a good sampling of your pond's depth.

### SHAPE

Ponds with an island, cove, irregular shorelines, or other unique features require more diffusers that a uniformly shaped pond as these features limit the circulation of oxygenated water. As noted above, breaking odd-shaped ponds into sections can assist you determining how many diffuser plates would be needed for the entire pond.