过去,一般不采用在悬吊铅鱼的钢丝绳上穿插标志、记读钢丝绳长度的办法,来了解铅鱼入水的深度。近年来,部分水文站改用了水深记数器,即在悬吊铅鱼的支架上装上记数器测深。用这种记数器测深不仅可以延长钢丝绳的寿命,减少测站穿插标志的工作,而且操作简单,特别是在夜间测流时更为方便。目前使用的有转数表式和闹钟式两种水深记数 In the past, it was not usual to use the method of inserting the mark on the rope hanging the lead fish and reading the length of the rope to know the depth of the lead fish entering the water. In recent years, some hydrological stations have switched to the water depth register, that is, a counter depth gauge is mounted on the bracket of the suspended lead fish. Sounding with this register not only prolongs the life of the rope, but also reduces the need for station interspersed signs, and it is easy to operate, especially when it comes to measuring the flow at night. Currently used are the number of revolutions and alarm clock two kinds of water depth count