| 聲波式流速儀 | Acoustic Current Meter, ACM |
| 聲波都卜勒流速儀 | Acoustic Doppler Velocimeter, ADV |
| 聲波都卜勒流速剖面儀 | Acoustic Doppler Current profiler, ADCP |
| 風速儀 | Anemometer |
| 交角修正 | Angularity Correction |
| 含水層 | Aquifer |
| 阻水層 | Aquitard |
| 自動化GPS 漂流浮標 | Automatic GPS Drifting Buoy |
| 輔助水尺 | Auxiliary Gage |
| 水準點 | Bench-mark |
| 船上量測 | Boat Measurement |
| 布拉格散射 | Bragg Scattering |
| 橋上量測 | Bridge Measurement |
| 近海自計觀測網觀測站 | C-MAN Station |
| 儀器檢校 | Calibration |
| 明渠水力履性圖 | Channel Hydraulic Performance Graph, HPG |
| 拘限含水層 | Confined Aquifer |
| 控制斷面法 | Controlled-section Method |
| 近海自計觀測網路 | Coastal-marine Automated Network, C-MAN |
| 海岸氣象站 | Coastal Weather Station |