for landfills accounted for as enterprise funds, a portion of the estimated cost of closure of solid waste landfills should be charged as an expense and a liability of the landfill operation each year on a Units-of-production method.
The unit of production approach is a way to figure out how much an asset's value depreciates over time. When an asset's worth is more closely correlated with the quantity of units it creates than the duration of time it has been in use, it becomes useful. This strategy frequently results in more depreciation deductions being made in years when the asset is heavily used, which can then balance out years when the equipment is not being used as much.
This strategy is especially used for assets like machinery or manufacturing equipment that go through a lot of wear and tear based on actual use per unit.
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