Hydrologic computation shall analyze and compute the whole or parts of the followingitems according to the requirements of engineering designs：Collection, processing and review of basic data; Runoff computation;Design flood computation; Sediment computation; Water level computation and determination of stage-discharge relationships;Analysis and computation of meteorological elements, water surface evaporation, water quality, water temperature and ice regime;Design for system of hydrologic data collection and transmission; Analysis and computation of other hydrologic elements.水文計算應根據工程設計要求，分析計算下列全部或部分內容：基本資料的搜集、整理和復核、徑流分析計算、設計洪水計算、泥沙分析計算、水位分析計算和水位流量關系擬定、氣象要素、水面蒸發、水質、水溫和冰情分析計算、水文測報系統設計、其他水文要素分析計算。