ISO 9825:2005专门涉及大河流量的测量和洪水中河流的测量。当有必要使用间接方法估算流量时，还描述了相关的现场测量。

ISO 9825:2005 deals specifically with the measurement of discharge in large rivers and the measurement of rivers in flood. It also describes the relevant field measurements when it becomes necessary to use indirect methods of estimating discharge.