(一)水位观测:水位变化为推求一切水情变化的基本依据,必须认真观测,掌握其变化的环节,观测到最高最低水位,具体规定如下:甲、汛期:各报纸站应按每日二十四小时逐时观测,非报汛站(包括水文站、水位站)在一般情况下每日五时至二十时逐时观测,如水情变化不大均可酌情按每二小时观测一次;但在洪峰期间均须 (I) Water level observation: The change of water level is the basic basis for deducing all the changes of water regime. It must be carefully observed and grasped its changes and the highest and lowest water level observed. The specific provisions are as follows: A and flood season: Hourly observation at fourteen hours, non-flood reporting stations (including hydrological stations and water level stations) are under daily observation from 5 pm to 20 pm on a day-by-hour basis. If there is not much change in water conditions, they can be observed every two hours as appropriate. However, during peak periods are required