# Planning: Pond Calculations

Here’s the rule of thumb for measurement of your pond.

SQUARE FEET on the surface area.

• Rectangle

length x width = Square feet of pond

• Circular

3.14 (1/2 diameter x 1/2 diameter) = square feet of surface

NUMBER OF CUBIC FEET

• Rectangle

average length x average width x average depth = volume in cubic feet

• Circular

3.14 (1/2 diameter x 1/2 diameter x depth = volume in cubic feet

To calculate GALLONS in your pond

cubic feet x 7.48 = capacity in gallons

FORMULAS TO DETERMINE APPROXIMATE AMOUNT OF ROCK NEEDED:

• Quantity of BOULDERS in a pond (tons) = length (ft) x width (ft) divided by 65
• Quantity of BOULDERS using 1.2.1 ratio. Length x Width divided by 40
• Quantity of 1/4 inch to 3 inch GRAVEL (tons) = tons of boulders x .45
• Quantity of BOULDERS in a STREAM = 3/4 TON PER 10 FEET OF STREAM LENGTH

Around the FACE of A SIGNATURE 6000 BIOFALLS you will need approximate 3/4 TO 1 1/4 tons of boulders.

Note: If you are building a large water feature you will need to increase the tonage of rock as the stone you will use will be larger and carry more weight.

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