The frequently occurring unordinary flood stage increases the difficulty of flood control practice in the river. 频繁发生的异常洪水位现象给渭河下游防洪增加了困难。
The paper shows that the altitude of the shell mound relics can be used as the upper limit of the rare flood water level, and this is examined by geomorphological method. 研究表明，贝丘遗址的高程可作为稀遇洪水位的参考上限，对此，还通过地貌方法进行了检验。
