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消防电梯必须要下到地下室吗？ - 工程设计 - 项目管理 - 氿上知道
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但是，在消防电梯井底设排水口非常必要，对此作了明确规定。将流入梯井底部的水直接排向室外，有两种方法：
消防电梯不到地下层，有条件的可将井底的水直接排向室外。为防雨季的倒灌，排水管在外墙位置可设单流阀。
不能直接将井底的水排出室外时，参考国外做法，井底下部或旁边设容量不小于2.00m3的水池，排水量不小于10L/s的水泵，将流入水池的水抽向室外。
高规防火规范6.3的解释里有。