But when flood level is rising gradually, controlling the flood level's rising is also very important to prevent dike piping.
由于洪水位还有不断上升的发展趋势，防治管涌还应注意控制洪水位上升的问题。
Rising and falling of flood water level not only leads to the increase and decrease of underground water near the bank, but also restricts the change of runoff outflow routing.
洪水的涨落不仅引起河岸附近地下水蓄水量的增减，同时也制约着地下径流过程的变化。
Flood and ebb, it's about timing: Tide is a phenomenon of regular rising and falling of sea level mainly influenced by the gravitation of sun and moon.
涨潮退潮，掌握时机：潮汐是一种有规律的海面升降现象，主要是受太阳与月亮引力的影响。
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