Approximately 0.557 hectares.
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You would need 31.88 cubic yards of topsoil to cover 855 sq feet at 6 inches deep.
It will cover 324 sq/ft or 36 sq/yrd at 1" thick It will cover 162 sq/ft or 18 sq/yds at 2" thick It will cover 108 sq/ft or 12 sq/yds at 3" thick It will cover 81 sq/ft or 9 sq/yds at 4" thick.
To find the volume of soil needed, first convert the depth to feet (3 inches = 0.25 feet). Then, multiply the area (400 sq ft) by the depth (0.25 ft) to get the volume: 400 sq ft * 0.25 ft = 100 cubic ft. Therefore, you will need 100 cubic ft of soil to cover 400 sq ft at 3 inches deep.
"Rule of thumb, 1.5 tons equals a cubic yard. 1 ton covers approximately: 220 sq ft at 1 in depth 110 sq ft at 2 in depth 73 sq ft at 3 in depth 36 sq ft at 6 in depth 22 sq ft at 9 in depth" east haven landscape 2008.
The Southern Ocean covers approximately 7.8 million square miles.