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海河流域地跨京、津、冀、晋、鲁、豫,蒙、辽8个省、市、区,面积31.9万平方公里,人口9600万人。流域内土地资源和矿产资源丰富,工业基础雄厚,灌溉农业发达。1984年工农业总产值达1302亿元,占全国12.2%,在我国具有十分重要的战略地位。但流域气候条件和水资源条件很差,春旱,秋涝,冬季干冷。流域年均降雨量556毫米,年均蒸发量464毫米,占降水量的83.7%,多年平均径流量292亿立方米,占全国河川径流总量的1.1%。降水是海河流域水资源补给的主要来源。但流域内降水的年内分配极不均匀,7、8月份降水为全年的70～80%,另20～30%降在其余10个月内;并
Haihe River Basin across Beijing, Tianjin, Hebei, Shanxi, Shandong, Henan, Mongolia, Liao eight provinces, cities and districts, an area of 319000 square kilometers, population 96000000 person. The basin has abundant land resources and mineral resources, a solid industrial foundation and developed irrigated agriculture. In 1984, the gross output value of agriculture and industry reached 122.2 billion yuan, accounting for 12.2% of the national total. It has a very important strategic position in our country. However, the basin climatic conditions and water resources are poor conditions, spring drought, autumn floods, dry and cold winter. The average annual rainfall of 556 millimeters, with an average annual evaporation of 464 millimeters, accounting for 83.7% of the precipitation, the average annual runoff of 29.2 billion cubic meters, accounting for 1.1% of the total river runoff. Precipitation is the main source of water supply in the Haihe River Basin. However, the distribution of precipitation in the basin is extremely uneven during the year. Precipitation in July and August is 70-80% of the whole year while the other 20-30% falls within the remaining 10 months.