The extraction of soil erosion in complex topographical region is much more difficult than that in flat region.
相对与地形平坦地区，复杂地形区土壤侵蚀的提取存在较大的难度。
As the terrain in plain region is flat, the topographical height difference for the drainage pipeline cannot be utilized so as to cause the pipelines in the lower reaches are buried too deeply.
平原地区由于地势平坦，排水管道往往无地形高差可以利用，造成下游管道埋深过大。
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