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断面时段洪量即某一时段通过某一断面的总水量。它和最大洪峰流量一样，是判断洪水大小的重要依据。但平原河流往往水网交错，江湖贯连，汛期大洪水还存在分洪溃口，造成洪水在时程上的重新分配，实测断面时段洪量往往不能反映实际洪水量级，且洪水还原计算复杂，难以将历年洪水系列还原到天然状况。基于入库洪水理论，引入总入流概念，探讨平原河流洪量计算方法，并将该方法应用到长江中下游平原区，计算了下垫面条件悬殊的本世纪两次特大洪水———１９９８ 、１９５４ 年洪水的洪量，由于计算基础统一，用其计算成果可比较这两次洪水的量级大小。
Cross section of the flood that is a certain period of time through a section of the total amount of water. It is the same as the maximum peak flow, it is an important basis to determine the size of the flood. However, the plains rivers are often staggered by water networks, rivers and lakes are interlinked, flood diversion floods exist in major floods in flood season, resulting in redistribution of flood time histories. Actual measured flood season levels often can not reflect the actual flood levels, and the flood reduction calculation is complicated Over the years the flood series to restore the natural condition. Based on the theory of flood storage, the concept of total inflow was introduced to investigate the calculation method of flood volume of plain river. The method was applied to the plain area in the middle and lower reaches of the Yangtze River to calculate two extraordinary floods of this century --- 1998, 1954 Due to the uniform basis of calculation, the flood volume per year can be used to compare the magnitudes of the two floods.