Historical flood is the flood that has occurred in the local area. Using historical floodinvestigation can improve the calculation accuracy of design flood.
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。
2
Rescue work and an investigation into the cause of the flood are underway.
目前，救援工作和事故原因调查正在进行中。
3
Studies show that surface sediments of the flood land seem to be the best sampling media in ultra-low density geochemical investigation in forest-swamp areas.