hydrographical curve

例句：

1. 1. The hydrographer was responsible for the water quality monitoring in the city.
   水文学家负责该市的水质量监测工作。
2. 2.The hydrographer's report revealed that the river had been contaminated with industrial waste.
   水文学家的报告显示，这条河流被工业废水污染了。
3. 3.The hydrographer's findings were crucial in determining the cause of the flood.
   水文学家的发现对于确定洪水原因至关重要。