河流每年发洪泛滥,是历古以来便有的事;古人避水而居、渔猎而食,在广东这样的丘陵地带上,洪水是不会形成什么“灾”的。只有当生产活动达到一定水平,例如两岸出现了市镇、农业地带等之后,水灾才有可能形成。广东省历年水灾史料对灾情的描述,也正好反映出随同社会发展而灾情陆续发生变化的过程。 在研究水灾的发展和治理方案时,往往要作历年资料的比较,但如果仅只停留在发生频率、淹浸面积等数据的对照而不深入进行灾情内容的比较,是不够的,而且易于得 Floods flood rivers every year, is something that has existed since ancient times; ancients to avoid water, fishing and hunting and feeding, in hilly areas such as Guangdong, the flood will not form what “disaster.” Only when productive activities have reached a certain level, such as the emergence of towns and agricultural areas on both sides of the strait, can floods be formed. The historical description of floods in Guangdong Province over the years shows exactly how the disaster has changed along with the social development. In the course of studying flood development and treatment plans, it is often necessary to make comparisons over the years. However, it is not enough to simply compare the occurrence frequency,