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Pond Calculations

Here is a very handy list of calculations, good practices regarding ponds and water gardens.

I recommend you bookmark this page for later reference.

Calculate liner size:
Measure the maximum length and the maximum width of the pond. Add the maximum depth x 2 to each dimension then add another two feet of liner to each dimension for your anchor trench.

Calculate approximately how many gallons of water are in a pond:
Average length x Average width x Average depth x 7.48 = Total gallons.
Or be lazy and use our e-calculator below (that’s what i do) :)

If you can’t view our Pond Calculator, you need to install the Flash 6 Player. Get it HERE!


Calculate approximately how many gallons of water are in the stream:
Maximum length x Average width x 0.25 x 7.48 = Total gallons. (This would be water in transition. Water that has to be supplied by the lower pond is water in transition. Upper ponds, streams or multiple streams all contribute to this total number.)

Calculate approximately how many gallons of water are required to overflow an upper pond:
Maximum length x Maximum width x 0.8 x 0.25 x 7.48 = Total gallons required to overflow upper pond.
(This would be water in transition.)

Calculate how many gallons of water are available to put in transition, before the water level in the lower pond, is drawn down below the skimmer opening:
Maximum length x Maximum width x 0.8 (unless your pond is completely square) x 0.33 x 7.48 = Total gallons available at the skimmer faceplate. (It is recommended that no more than half of the volume of water available at the faceplate is put in transition. If power is interrupted the lower pond will have to receive all the water in transition, or the pond will overflow)

Calculate how many gallons of water are in a Just-A-Falls reservoir:
Length x Width x Average depth x 7.48 x 0.80 = Total gallons.
(60% of the reservoir is mass / rock and 40% is water.)

Calculate how many inches of draw down there will be in a Just-A-Falls reservoir to fill the stream:
Total gallons contained in reservoir / Depth of reservoir in inches = gallons per inch. (Calculate how many gallons of water your stream requires using the stream formula. Try to have three times as much water in your reservoir than you will have in transition.)

Total gallons required for the stream / Gallons per inch in reservoir = Total inches the water level will be drawn down in reservoir. (Make sure that there will be enough water remaining in your reservoir to keep the pump completely submersed in water. This is required so that the pump will cool properly.)

Calculate how much it will cost to run the pump:
Volts x Amps x 24 (hours of operation) / 1000 x .1 = Cost for a 24 hour period.
Amps x Volts = Watts

Stream Depth Fractions:
.50 = 6″ .41 = 5″ .33 = 4″ .25 = 3″ .16 = 2″

Surface Area Formula:
(Length x Width) / 43,650 = Acres

Don’t forget to bookmark, save or print this for later reference.

Have a great day. – Paul

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Related posts:

  1. Res – Cubes for Pondless Kits & Falls
  2. Pumps & Pipes – It’s all about the flow & how much

  • http://www.pondpro2000.com Pondpro2000

    OMG! How difficult to do all that I got just easy way to care about my
    pond and that is Pondpro2000.