The principle for water balance analysis is to reversely derive the area of water supply according to runoff amount in the karst system, further to determine the position of the groundwater divide.
水均衡分析法原理是根据岩溶系统径流反推补给面积，进而确定地下水分水岭的位置。
2
The position measuring system was another important system in the new balance calibration system.
新研制的天平校准系统已经投入实际应用。
3
To verify the correctness of error compensation system, we have three evaluation items: repetition precision, position precision and reverse balance.