Forecastingthe water level with tidal effect is di fficulty， because it is influenced by fl ood and tidal. This paper treats the wat er level as time series and compares thewater level forecasted by some model wi th observed， the result shows that the n eural network model is suitable for tida l river and the ARMA（2，1） is suitable fo r high level forecasting， but for floodriver， the forecasting ability of all mo dels should be improved.
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But experts say the situation would have been far worse if not for the levees, spillways and other flood controls built along the river.
但专家称，如果不是沿河修建的堤坝，溢洪道和其它防洪设施，情况会更糟糕。
But for wide scope of the Yangtze river flood, with high peak and large volume, the flood control situation in partial areas is still severe.
但由于长江洪水范围广，峰高量大，部分地区防洪形势仍然严峻。
The Jiepai reach in the middle and lower Yangtze River is not only an important one for its flood control. but it is also well known for its hindering navigation.
界牌河段是长江中下游防洪的重要河段，亦是长江中下游著名的碍航河段。
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