hydrograph的用法和样例：
词汇搭配
- demand hydrograph 需水量过程线...
- level hydrograph 水位过程线
- flood hydrograph 洪水过程线
- discharge hydrograph 流量过程线图...
- complex hydrograph 复合水文过程线...
- inflow hydrograph 人流过程线
- composite hydrograph 复合水文过程线...
- depletion hydrograph 亏水过程线
- hydrograph separation 水文分析,过程线分割...
- basic hydrograph 基本水文过程线...
