| 蒸發儀 | Evaporimeter |
| 蒸發散儀 | Evapotranspirometer |
| 濾管 | Filter Tubes |
| 浮標 | Float |
| 漂浮係數 | Float Coefficient |
| 漂浮法 | Float Method |
| 浮筒式水位計 | Float Type Stage Recorder |
| 自噴井 | Flowing Well |
| 潮位計 | Gage Tide |
| 測水斷面 | Gaging Section |
| 水尺基準面 | Gauge Datum; Gage Datum |
| 地溫計 | Geothermometer |
| 整合封包無線電服務 | General Packet Radio Service, GPRS |
| 全球定位儀 | Global Positioning System, GPS |
| 全球降水觀測計畫 | Global Precipitation Measurement, GPM |
| 全球行動通訊系統 | Global System for Mobile Communication, GSM |
| 地下水監測井 | Groundwater Monitoring Wells |
| 透地雷達 | Ground Penetrating Radar(GPR) |
| 高(低)潮位 | High/low Water |
| 洪水痕跡 | High Water Mark |