So, new theory and methods are being urgently needed for the study on the rainfall-runoff forecasting.

因此，降雨径流的研究迫切需要引入新的理论和方法。

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The time span of middle-term optimization model equal foreseeable period of runoff forecasting (3 to 7 days), and the optimization period is one day.

中期模型优化的时间跨度等于中期入库径流预报的预见期（3-7天），优化时段为一天。

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This article presents the principle of ANN briefly in the application of flood forecast and an improved network algorithm of rainfall runoff forecasting.

简要介绍了人工神经网络用于洪水预报的基本原理，对降雨径流预报的网络模型进行了改进。

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There are many methods for medium- and long-term runoff forecasting, such as time series, multiple linear regression and so on, which often have deviation in forecasting precision.

径流中长期预报一直以来都是人们关注的热点研究问题，常用的时间序列法、多元回归分析法等都存在预报精度偏差过大的问题。

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There are many methods for medium- and long-term runoff forecasting, such as time series, multiple linear regression and so on, which often have deviation in forecasting precision.

径流中长期预报一直以来都是人们关注的热点研究问题，常用的时间序列法、多元回归分析法等都存在预报精度偏差过大的问题。

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