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水系,就是一条河道的干流和支流组成的河网。在我国,水系的形状不是单一的,而是多种多样的。树枝状水系:这是我国最普遍的一种水系,形状象树枝一样。这种水系的典型代表是珠江,它的支流交错着汇入干流,水流先汇入的先泄,后汇入的后泄,洪水不易集中,发生洪水灾害的机会不多。格子状水系:在我国也是比较多的。干流和支流是直角相汇,互相交错成格子状。
Water system, is a river channel composed of the main stream and tributaries. In our country, the shape of the water system is not single but varied. Dendritic water system: This is the most common type of water system in our country, shaped like a tree branch. The typical representative of this type of water system is the Pearl River. Its tributaries are staggered with the main stream that is imported into the mainstream. The water flows in first, and then flows back into it. The flooding is hard to concentrate and there is not much chance of flood disasters. Lattice water system: is also more in our country. The main stream and tributaries are at right angles, staggered into a grid.