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Yes, you can put new mulch over old mulch, since it’s decomposable. The only reason you should remove old mulch before laying new mulch would be to maintain a certain aesthetic. 

No one likes running out of materials during a project, so calculating the right amount of gravel needed for your driveway is an absolute must. Multiply your driveway’s length by width by the depth of the gravel (in feet). For gravel depth, convert to a decimal (i.e., 4 inches is 0.33 feet). This will give you the cubic feet of material that you need. 

If you’re looking for cubic yards, divide that above number by 27.

Regular maintenance involves raking or leveling out any displaced gravel, filling in low spots, and adding fresh gravel as needed to help prevent potholes and ruts. If you live in an area with heavy rain, checking the drainage and reinforcing the edges periodically can help prevent erosion.

A 50-pound bag of pea gravel equals approximately one-half of a cubic foot. That amount will cover a three-square-foot area to a depth of about two inches. A three-square-foot area with equal-length sides is approximately 1.73 feet by 1.73 feet, or about 20.75 inches on each side.