Will be putting in a fish pond with waterfall this summer.


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Welcome to the GPF! All the good advice has already happened here, so I'll just offer one unsolicited piece: lots of photos! Photograph each step in your progress. You'll look back and be glad you did!
 
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Rashad, the whole interior will be cinder blocked and concreted, so no worries concerning roots. skimmer is a good call I will definitely do that!
Never underestimate tree roots, even a 4 inch thick driveway is no match.
 
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started digging pond.
 

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957 gallons

4x16x4 = 1900 gallons

Those calculators are pretty difficult to use accurately. I think it is making the assumption that you will have shelves that occupy 50% of your space, and so is dividing your volume by 2. But it doesn't tell you that. And it's quite the assumption.

Would it be okay if I created a "pond volume estimation" tutorial? The math is pretty simple—even for complex shaped ponds—when you know the conversion factors and take it step by step. Does this already exist somewhere? I think most of the calculators out there lead you wildly astray by making assumptions they shouldn't and not telling you how they're calculating.
 
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4x16x4 = 1900 gallons

Those calculators are pretty difficult to use accurately. I think it is making the assumption that you will have shelves that occupy 50% of your space, and so is dividing your volume by 2. But it doesn't tell you that. And it's quite the assumption.

Would it be okay if I created a "pond volume estimation" tutorial? The math is pretty simple—even for complex shaped ponds—when you know the conversion factors and take it step by step. Does this already exist somewhere? I think most of the calculators out there lead you wildly astray by making assumptions they shouldn't and not telling you how they're calculating.
I sent an email to Pond guy regarding their calculator. Have not heard back but I think you are right about them assuming plant shelves!
 
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957 gallons
@addy1 i dont believe that calculation is true, as i recently found out, thepondguys calculator is off for some reason. His pond is actually closer to 1900 gallons (before any rocks or anything displaces water)
 

addy1

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@addy1 i dont believe that calculation is true, as i recently found out, thepondguys calculator is off for some reason. His pond is actually closer to 1900 gallons (before any rocks or anything displaces water)
Thanks i just tossed in the numbers, never thought about the outcome.
 

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This is the reply I got from PondGuy regarding their calculator- @combatwombat called it- they figure ponds are not square. I think they should have a notation somewhere regarding how they calculate.

Thank you for your question. Our calculator uses length X width X average depth X 7.48. It assumes that the pond doesn't have straight sides and a flat bottom. Usually the bottom of a pond is sloped or has steps, so the entire pond isn't the maximum depth. If the pond has vertical walls at the edge and a relatively flat bottom, then you would use the maximum depth for your calculation. If there is a sloped bottom or steps in the pond, the entire pond isn't going to be the maximum depth, so the average depth needs to be used to determine the volume of water in the pond. Average depth can be a little harder to determine, but for our calculation, we divide the maximum depth by 2 to estimate the average depth. This works well for a pond with an evenly sloped bottom or with evenly spaced steps going down from the shore to the bottom of the pond. Without knowing the exact shape of the outside of the pond or the bottom of the pond, we try to give our best estimate for pond volume and usually average depth gives a much closer value to the actual gallons in the pond than using the maximum depth for the calculation. If you can provide numbers as to the size of your pond and the shape of the bottom of the pond, I can see if I can come up with a more exact estimate of the water volume of your pond.
 
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Pump-camber with removable cap stone to protect the pump
 

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