山东省桓台县地处黄河下游南侧的山前倾斜平原,耕地53万亩,其中井灌面积47万亩。多年平均降雨量为595.3毫米,以提取地下浅层水灌溉为主。现有机井8,743眼,排灌机械13,332台。由于连年干旱,地下动水位埋深从1969年5～6月份的6～10米下降到去年8月 Huantai County, Shandong Province is located in the southern slope of the lower reaches of the Yellow River plains, 5300 acres of arable land, of which 470000 acres of irrigated area. The average annual rainfall of 595.3 millimeters to extract underground shallow water-based irrigation. The existing 8,743 wells, irrigation and drainage machinery 13,332 units. As a result of successive years of drought, the groundwater level dropped from 6 to 10 meters in May-June 1969 to August last year