- The rivers were falling back from their flood peaks.
- Before the arrival of the huge flood peak, the Yangzi River successfully opens its sluice gate and releases the flood.
- The frequently occurring unordinary flood stage increases the difficulty of flood control practice in the river.
- The paper shows that the altitude of the shell mound relics can be used as the upper limit of the rare flood water level, and this is examined by geomorphological method.
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