来水量增多而河道比降变小，造成局部洪峰水位异常壅高。
Increasing of water and decreasing of gradient of channels, the flood water level rose abnormally in some local sections of river.
90年代以来，珠江三角洲网河区大部分水位站同级流量的洪水位普遍下降的同时，局部河段洪水位却异常壅高。
In the 1990s, the flood water level was lower than before at most stations in the river network of the Pearl river delta under the same grade of runoff.
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