The answer will depend on the depth to which the dirt is spread.
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100 cubic feet for every foot of depth.
There is no dirt in the hole, but if you want to know how much dirt was removed to create the hole, then:3 acres is an amount of area (you don't have 'square acres'). You could express this volume as acre-feet, but this term is usually used when referring to flooding (an acre of land flooded with 1 foot of water, for example). 1 acre = 43560 square feet, so 3 acres = 130680 square feet.(130680 square feet)*(200 feet) = 26136000 cubic feet {26.136 million cubic feet} In the dirt industry, the standard measurement is cubic yards {often referred to as just 'yards' of dirt}. There are 27 cubic feet in a cubic yard, so this is equivalent to 968000 cubic yards.
First you have to know how many cubic yards are in 10 tons, just ask the company your buying the material from, they know as they do this all year long. pea gravel, road base, and sand will all cover at a different rate because of the size of the material. one cubic yard of material is 3ft x3ft x3ft or 27 cubic feet If you spread 3 inches deep the one yard will cover , on average, 108 square feet surface area. At 2 inches deep one cubic yard will cover approx 162 square ft of surface aera. chet2010
9.26 cubic yards for every inch of depth.
that is 333 cubic feet,or 12.3 cubic yards At 100 pounds per cubic foot,that is over 33,000 pounds of gravel