求翻译：根据《北京市建设工程施工降水管理办法》和《北京市建设工程施工降水管理办法实施细则》，2008年3月1日起新开工工程限制施工降水，若采用施工降水时，要对降水方案及止水帷幕进行经济技术对比，并须由建设单位组织专家评审，通过方可实施。经我方初步核算，本工程降水不满足经济及技术可行的条件，须采取止水帷幕。经经济技术比选，本次设计考虑采用“护坡桩+桩间搅喷桩”止水帷幕方案，同时设置疏干井和明沟等，并于基坑外侧四周设置水位观测井和应急井。是什么意思？

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