Hydrologic analysis and calculation of preventing floods and droughts, and engineering and non-engineering measures to protect water resources planning, design, provides technical com-pliance with the design standards of hydrological data. Its task is to assess the flood level, The transit flow, flooding convergence time, and the confluence of water each time period and make possible the probability of correct description. Thereby making the future hydrological regime probability estimates in order to make optimal planning and decision-making on this basis.%水文计算对防止水旱灾害和保护水资源的工程或非工程措施的规划、设计,提供符合规定设计标准的水文数据的技术。其任务就是评估洪水水位、过境流量、洪水汇流时间,及各个时间段的汇流水量并作出尽可能正确的概率描述。从而对未来的水文情势作出概率性预估,以便在此基础上作出最优的规划设计和决策。
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