Precipitation variable showed an evident uptrend, and aridity and waterlog became more frequent because of the stability of precipitation fall.
降水变率呈明显增大趋势，表明降水稳定性降低，干旱与洪涝灾害更加频繁。
Calculating design drainage discharge have important significance for water safety and derating economic losses of waterlog in the polder areas.
圩区设计排涝流量计算，对圩区的水安全，有效减免涝灾经济损失有着重要意义。
This paper introduces The Times, the disaster area and the disaster degree of flood and waterlog in Haihe River area.
介绍了历史上海河流域洪涝灾发生的次数，受灾范围，受害程度等。
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