四、在自來水處理中，沉澱池可用於去除混凝後水中的顆粒物質。沉澱池以溢流率（overflow rate）為設計參數。已知一矩形沉澱池的長（L）、寬（W）、高（H），混凝後的出流水進入沉澱池的流量為 Q，且出流水中顆粒物質的沉降速度為 UT。請說明以溢流率為沉澱池設計的原理及其假設。（20 分）

四、英文作文：（30 分） September 22 is World Car-Free Day. This year, passengers could travel free of charge on all regular bus services in Taipei and New Taipei City. The initiative was intended to raise public awareness of alternative forms of transportation and encourage people to adopt more environmentally friendly ways of commuting. Around the world, people also observe “No Diet Day” on May 6 and “Buy Nothing Day” in late November. If you had the opportunity to establish a similar day like these, what would it be? Explain the purpose of your initiative, how it would be carried out, and what benefits or challenges it might bring. Write an essay of approximately 300 words. Use relevant reasons and examples to support your ideas.

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