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Blue outlined pumps are submersible pressure pumps.

Red outlined pumps are surface pumps.

Black outlined pumps are pond and utility pumps.

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How to size a pond pump

The first thing to do is to work out the volume of your pond.
The best way to do this is to measure the average length, average width and average depth of your pond in feet.

To measure the average each one, get several measurements, add them up and divide the sum by the number of times you took the measurement.

For example, take four measurements from different sections of the length taking the shortest and longest points in consideration then sum them up and divide by four. Do the same with the width and depth. Jot the measurements in feet and multiply them to each other (Length x Width x Depth).

Then, multiply the product by a factor of 7.48 to get the volume in gallons.
For an average length of 12 feet multiply by average width of 6 feet multiply by average depth of 4 feet equals 96 multiply by 7.48 equals 2,154.24 gallons
(12ft x 6ft x 4ft=288ft x 7.48= 2,154.24 gallons).
If your pond has fish you need to circulate the water every hour
(e.g. 2,154 gallons requires a pump of minimum 2154 GPH)
If your pond does not have fish you need to circulate the water every 2 hours
(e.g. 2,154 gallons requires a pump of minimum 1077 GPH)
If you have a water fall you also need to take this into consideration
To do this you need to estimate your waterfall's height by measuring the vertical height from the top of the pump to the top of the waterfall.
Then add a foot or lift height for every 10 feet of hosing to account for loss of volume due to hose resistance.
To calculate the flow in GPH, for every inch of width of the channel of waterfall spillway you would need to add 100 GPH. Therefore, for a spillway of 10 inches wide you would need 1,000 GPH.

So we have a 2154 gallon fish pond
with a 6ft high water fall (from the top of the pump) which is 10” wide
and a pipe length of 10 feet
So our duty is 2154 + 1000 = 3154 GPH at 6 + 1 = 7 Ft
=> 3154 GPH @ 7ft or   (52.56 gpm @ 7ft) (gpm = gallons per minute)

As you can see above the LEADER CLEAR ANSWER 3 will give 52.5 gpm at 13 ft.
You should always pick a pump above the required duty to allow for slight differences as you are using average measurements