面积井网注水 repeating pattern flood
积水井
Stagnant well
以上为机器翻译结果，长、整句建议使用 人工翻译 。
顶盖内积水正常情况下通过自流排水排至积水井，紧急状态下通过装在廊道内的自吸泵排水。
Normally, the cumulated water in top cover is drained to cumulated water well by gravity drainage, in emergency situation, the water would be drained by the self-priming pump installed in gallery.
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