Formulas to Calculate Approximate Quantity of Rocks for Ponds

Formulas to calculate the approximate tons of rocks to use in a 2ft. deep pond.

• Quantity (tons) of boulders: length X width divided by 65
• Quantity (tons) of ¼ - 3” Gravel: Tons of boulders used X 0.45
• Quantity (tons) of boulders used in a stream: ¾ ton per 10 ft. stream length
• Quantity (tons) of ¼ - 3” gravel used in the stream: ½ tons per 10 ft. stream length
• Quantity (tons) of boulders used around the face of a Standard Biofall: ¾ - 1-1/4 tons

Note: Quantities of stone may differ depending on type of stone used filter

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