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水库回水计算成果是确定水库淹没处理范围的依据，关系到水利水电工程正常蓄水位和汛期限制水位的合理选定。因此，提高水库回水计算精度是一个重要的课题。影响水库回水计算成果和精度的主要因素是：河道断面特性值Ｆ、沿程糙率ｎ、河段计算流量Ｑ以及上下断面间河段距离△Ｌ；要使这些因素正确合理就要合理布设断面、提高测量精度，应用计算机划分主边槽，深入细致地分析研究沿程糙率ｎ。
The calculation result of reservoir backwater is the basis to determine the reservoir inundation treatment range, which is related to the reasonable selection of water level for water conservancy and hydropower project and limited water level in flood season. Therefore, improving the accuracy of reservoir backwater calculation is an important issue. The main factors influencing the calculation results and accuracy of reservoir backwater are: the river section characteristic F, the roughness n, the flow Q and the distance between the upper and lower sections △ L; to make these factors correctly and reasonably, it should be laid rationally Section, to improve the measurement accuracy, the use of computer division of the main groove, in-depth and detailed analysis of roughness along the process n.