Size of my pond


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I am trying to determine the size of my pond in volume.

It is a highly irregular boundary, and what makes it trickier is the depth also vary greatly.

IMG_20221101_183235.jpg


I recently did a complete cleanout, and yesterday after hurricane Nicole left the pond was full again from the rain, so I drained it with a small utility pump. It is an Everbilt 1/4HP utility pump and it's specifications says "Flow rate: submersible utility 1600 GPH".

However it took 4 full hours to fully empty the pond. If it is truly doing 1600GPH then the pond has 5400G? I had previously did a rough area (very rough) and multiplied by an average depth of 2 feet and came to about 1000G.

What is a good way to accurately determine it's volume?
 
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You can estimate by taking good measurements and turning the whole space into a series of geometric shapes. Measure volume of all cubes and add them together.

Or you can get a $15 flow meter for your garden hose and meter it the next time you fill up. Then you'll know for sure.

As for your pump, most are lying through their teeth with their advertised flow rate. And when they aren't the advertised rate will only be applicable when it's pumping in perfect conditions with no discharge hose attached. If you were draining your pond through a long 1/2" garden hose or something, that will significantly reduce your flow rate.

If you want to know the flow rate you're actually getting, time a 5 gallon bucket fill. Divide 5 by the seconds to fill then multiply by 60 and multiply by 60 again. That's your true GPH. Keep in mind that rate will change (lower) as you drain the pond down since lower water level = more head pressure for the pump to overcome.

Best to just get the hose meter...
 
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A rough estimate is generally good enough. There are lots of pond volume calculators on the internet - here's one example:


Just put in width, length and average depth and you'll have a good estimate.
 
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It IS hard to judge though...Most of us have shelves in our ponds and different depths...I think the flow meter that combatwombat suggested would be the most accurate if you want an exact amount of gallons:)
 
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I will get a flow meter to get a better idea.

I did do some measurements and location today of the pond's perimeter at the usual water level. I then input that to a CAD software.

pondareas.jpg

The blue section is 116SF and the beige section is 56SF. I would estimate the blue section average depth is 28" and the beige section at 12" depth. That would put it at 326CF total. Converting to gallons that is 2438 gallons.

That is probably overestimating because around the perimeter the edges slope up (instead of a vertical face) and I haven't account for the bridge pier and other irregular pieces.
 

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