The internal cause is the week pervious beds occurred in the base of levee at the crevasse site.
决口处堤基大量软弱透水地层的存在，是决口的内在因素；
Research results could offer the base for reliability analysis of levee seepage stability.
研究成果可为堤防渗透稳定可靠性分析提供基础。
Research results could offer the base for reliability analysis of levee seepage stability.
研究成果可为堤防渗透稳定可靠性分析提供基础。
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