在辽阔的华北平原,分布着较大面积的低平坡洼地,这些地区,地下水位较高,地下水含有较多的盐,群众称咸水或苦水,也叫高矿化度水,农业生产常常遭受涝、碱、旱、咸影响,粮、棉作物产量低而不稳。当地群众在长期生产实践中认识到,除涝治碱,还必须改造利用地下成水,降低地下水位。因此,他们在大搞挖沟、修渠、平整、深 In the vast North China Plain, a large area of ​​low-lying depression is distributed. In these areas, the groundwater level is higher and the groundwater contains more salt. The public calls salt water or bitter water, also known as high salinity water, and agricultural production often Suffer waterlogging, alkali, drought and salinity, grain and cotton crop production is low and unstable. In the long-term production practice, the local people have realized that in addition to water and soil erosion control, they must also transform and utilize underground water and reduce the water table. Therefore, they are digging ditches, repairing channels, smoothing and deep