虽然设置地下排水道常为的是增加产量,但它还可减少地表径流及土壤侵蚀。因为排水一般设置在土壤流失轻微的相当平坦的耕地上,一般都没有考虑排水控制侵蚀的作用。但在5%坡度的耕地上,侵蚀可能是相当显著的,而且人工排水的耕地,通常靠近甚至少量的侵蚀也可能有害的环境条件敏感的地区。 这里介绍一个描述人工排水对侵蚀影响的计算机模拟方法,并阐明此法在北卡罗利纳州东部一种土壤上的利用。 Although underground drains are often designed to increase production, they also reduce surface runoff and soil erosion. Drainage is generally not considered for erosion control because drainage is generally located on relatively flat land where soil loss is minimal. However, on 5% sloping arable land, erosion can be quite significant, and artificial drainage of arable land is usually close to even small areas of the environment that are potentially eroded and potentially harmful. Here’s a computer simulation that describes the effect of artificial drainage on erosion and illustrates the use of this method on a soil in eastern North Carolina.