历史洪水是当地历史上曾经发生的，应用历史洪水调查可以提高设计洪水计算精度。
Historical flood is the flood that has occurred in the local area. Using historical flood investigation can improve the calculation accuracy of design flood.
历史洪水调查和邻近地区水文站设计洪水的地区综合对提高设计洪水的合理性和可靠性有重要作用。
The historical floods investigation and regional synthesizing of design floods at nearby hydrology stations are very important to increase the reliability and reasonability of the design floods.
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