Post by Carl on Jan 16, 2020 12:26:31 GMT -5
I've updated this article from the "Aquarium/Pond Answers" library
www.aquarium-pond-answers.com/2011/09/head-pressure-in-aquarium-and-pond.html
EXCERPT:
"If all else fails in calculations or you have already purchased a pump and simply desire to know the end flow rate, this can be simply calculated quite exactly;
Simply place a container under the outlet of your pump as it empties into the aquarium or pond after passing through all devices and water feature. Then time how long it takes to fill the container in exact measurements.
As an example if a 1 gallon container fills in 10 seconds, that is 6 gallons per minute or 360 gph (this works for metric using liters too).
Admittedly this can be rather difficult for very large flow rate pond pumps that pump say 10 times the previous examples flow rate (3600 gph versus 360 gph), as this would fill 1 gallon in a second. This would required a 5 gallon bucket that might be difficult to position 100% in the water flow discharge; the end result would be 5 gallons in 5 seconds to produce 3600 gph.
Calculating Aquarium Flow Turn Over
Video;
"
www.aquarium-pond-answers.com/2011/09/head-pressure-in-aquarium-and-pond.html
EXCERPT:
"If all else fails in calculations or you have already purchased a pump and simply desire to know the end flow rate, this can be simply calculated quite exactly;
Simply place a container under the outlet of your pump as it empties into the aquarium or pond after passing through all devices and water feature. Then time how long it takes to fill the container in exact measurements.
As an example if a 1 gallon container fills in 10 seconds, that is 6 gallons per minute or 360 gph (this works for metric using liters too).
Admittedly this can be rather difficult for very large flow rate pond pumps that pump say 10 times the previous examples flow rate (3600 gph versus 360 gph), as this would fill 1 gallon in a second. This would required a 5 gallon bucket that might be difficult to position 100% in the water flow discharge; the end result would be 5 gallons in 5 seconds to produce 3600 gph.
Calculating Aquarium Flow Turn Over
Video;
"