Which one of the following methods is not suitable for urban rainwater harvesting? नगरीय वर्षाजल संग्रहण के लिए निम्नलिखित में से कौन-सी पद्धति उपयुक्त नहीं है?

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Which one of the following methods is not suitable for urban rainwater harvesting? नगरीय वर्षाजल संग्रहण के लिए निम्नलिखित में से कौन-सी पद्धति उपयुक्त नहीं है?