观测地下水位是评价水资源量、开采条件和开展水资源规划工作的前提．现介绍几种观测设备的简易制做方法：一、测钟先准备0．4英寸或0．6英寸的铁管、直径1厘米的铁环，将铁管截成1～2厘米的长度．用电焊堵住一头，并把铁环（无现成的可用8号线或直径6毫米铁筋制做）焊在墙头上 Observing the groundwater table is a prerequisite for evaluating the amount of water resources, the conditions for mining and carrying out water resources planning. Here are a few simple ways to make observations of equipment: First, the clock to prepare first 0.4 inches or 0.6 inches of iron pipe, a diameter of 1 cm iron ring, the iron pipe cut into 1 to 2 cm length. Use electric welding to block one end and weld the hoops (without the available 8th line or the 6mm diameter steel bars) to the wall