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在我国七大江河中下游及沿海诸河受洪潮威胁范围(含上游集中连片的的洪水威胁区)地区中,以珠江流域中下游地区的人口密度和单位土地面积的农业产值两项指标居于首位,约为长江、黄河中下游的2倍;流域中下游地区单位土地面积的工业产值珠江则仅次于太湖流域居第二位,约为长江的3倍,黄河的6.5倍.珠江流域约有70％的大中城市和60％的工农业总产值集中在中下游沿江河谷和冲积平原上,这些地区人口稠密,经济发达,目前主要依靠堤防保护,一般只能防御5～20年一遇的洪水,一旦遇上超标准洪水,堤防溃决,损失惨重,将严重影响到社会经济的稳定发展,当引起各级政府和有关部门的高度重视.
In the middle and lower reaches of the seven major rivers in China and in the coastal areas affected by flood tide (including the flood threatening areas with upstream contiguous contiguous areas), two indicators of agricultural output value per unit area of the population in the middle and lower reaches of the Pearl River Basin Which is about twice that of the middle and lower reaches of the Yangtze River and the Yellow River. The Pearl River, the land area per unit of land in the middle and lower reaches of the basin, ranks second only to the Taihu Lake basin, about three times that of the Yangtze River and 6.5 times that of the Yellow River. About 70% of large and medium-sized cities and 60% of the total industrial and agricultural output are concentrated in the rivers and valleys and alluvial plains in the middle and lower reaches. These areas are densely populated and economically developed. Currently, they mainly depend on embankment protection, and they generally only defend 5-20 years In the event of a flood, once an unexpected flood occurs, the embankment will be smashed and suffered heavy losses, which will seriously affect the social and economic stability and development, which has aroused great attention from all levels of government and relevant departments.