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(一) 淮北平原农田外排水特征淮北平原经过建国以来多年的治淮水利建设,在农田排水方面,已经初步形成了骨干系统。众多的河道、大中级排水沟,在农田多余水量的排泄中,发挥了较为显著的作用。汛期除了南部沿淮沿河洼地因受外水顶托,内水不能及时排泄外,绝大部分地区(包括一般平坡河间洼地及部分南部洼地在内)在农田排水系统的作用下,均能进行不同程度的自流排水。但由于各地区的地理位置、地形条件以及
(A) drainage characteristics of farmland outside the Huaibei Plain Huaibei Plain after years of governance Huai water conservancy construction, in farmland drainage, has formed a preliminary backbone system. Numerous river courses, large and medium-sized drainage ditches, play a more significant role in the excretion of excess water in farmland. In the flood season, in addition to the impoundment of water along the river in the southern part of Huaihe River, the water can not be excreted in time, and most of the areas (including the ordinary depressions in the slope and some southern depressions) are under the action of the drainage system of the farmland To different degrees of gravity drainage. However, due to the geographical location of each area, topographical conditions as well