- fall-stage-discharge relation
- 水位: stage; water level
- 流量: rate of flow; flow; runoff; ...
- 关系: relation; filiation; relatio ...
- 水位流量关系: flow-slide relation; single－valued processing of stage－discharge relation; stage discharge relation; stage－discharge relation
- 水位流量关系环线: loop rating curve; loop stage-discharge relation; rating loop
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