Valley处屋脊水相交量大湍急，屋檐水增加水流量来不及排可能超出原防水能力。管子水至少应避开valley。

来源: IEbird 于 2019-11-18 11:56:38 [旧帖] [给我悄悄话] 本文已被阅读：次

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