| English | Chinese |
| hydrologic balance An accounting of the inflow to, outflow from, and storage in a hydrologic unit such as a drainage basin, aquifer, soil zone, lake or reservoir; the relationship between evaporation, precipitation, runoff, and the change in water storage | 水文平衡 (计算流域、含水层、土层、湖泊或水库这类水文系统中的流入量、流出量以及储水量；包括蒸发、降水、迳流以及储水量变化之间的关系。) |
| hydrologic balance | 水分〔水量〕平衡〔循环〕 |
| hydrologic cycle | 水分〔水量〕平衡〔循环〕 |
| hydrologic cycle The movement of water between the oceans, ground surface and atmosphere by evaporation, precipitation and the activity of living organisms, as one of the mayor biogeochemical cycles. Each day water evaporates from the oceans and is carried in the air from the sea over the land, which receives it as precipitation, and finally returns from the land to the sea through rivers, thus completing the cycle | 水文循环 (通过蒸发、降水以及生物活动使海洋、地表和大气中的水分转移，这是主要的生物地化循环之一。每天水分从海上蒸发进入空气，飘至陆地上空降落为雨，最终通过江河再汇回海洋，就这样完成一个循环。) |
| hydrologic disaster Violent, sudden and destructive change either in the quality of the earth's water or in the distribution or movement of water on land, below the surface or in the atmosphere | 水文灾害 (地球上水流品质，或地面上、地表下、大气中的水流移动或分配的剧烈、突然与毁灭性的变化。) |
| hydrologic flow The characteristic behaviour and the total quantity of water involved in a drainage basin, determined by measuring such quantities as rainfall, surface and subsurface storage and flow, and evapotranspiration | 水文流量 (通过测量降水量、地表和地下水库储水量，流量和蒸发量来确定流域盆地中总水量及其特征。) |
