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1959年以前,海河干流入海水量丰沛,多年平均径流95.6亿m3,历史上1937年最大为262亿m3。1959年以后,由于上游地区用水量不断增加
Before 1959, the sea water of the main stream of the Haihe River was plentiful, with a mean annual runoff of 9.56 billion m3 and a historical maximum of 26.2 billion m3 in 1937. Since then, the water consumption in the upper reaches has been increasing