英文文献：Sediment Deposits in Drainage Ditches: A Cropland Externality
英文文献作者：Ibrahim, Girmai,Forster, D. Lynn
英文文献摘要：
One of the externalities of soil loss from cropland is sediment deposits. Costs are incurred in sediment removal, and estimates of these costs are made. Also, sediment deposits are found to be significantly related to gross soil erosion estimates from the Universal Soil Loss Equation, an environmental parameter commonly used in economic analyses.