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2．有一河道，用碎石单层铺砌加固河床，通过的流量<img alt="" height="21" src="https://lms.ouchn.cn:443/api/uploads/458483/in-rich-contentcreated_at=1627616044" width="49">m³/s，允许流速<img alt="" height="19" src="https://lms.ouchn.cn:443/api/uploads/458484/in-rich-contentcreated_at=1627616044" width="52">m/s，桥下游水深<img alt="" height="24" src="https://lms.ouchn.cn:443/api/uploads/458485/in-rich-contentcreated_at=1627616044" width="51">m， 若<img alt="" height="19" src="https://lms.ouchn.cn:443/api/uploads/458486/in-rich-contentcreated_at=1627616044" width="57">，<img alt="" height="21" src="https://lms.ouchn.cn:443/api/uploads/458487/in-rich-contentcreated_at=1627616044" width="60">，<img alt="" height="21" src="https://lms.ouchn.cn:443/api/uploads/458488/in-rich-contentcreated_at=1627616044" width="52">，允许桥前壅水深度<img alt="" height="19" src="https://lms.ouchn.cn:443/api/uploads/458489/in-rich-contentcreated_at=1627616044" width="68">m。 设计小桥孔径<img alt="" height="19" src="https://lms.ouchn.cn:443/api/uploads/458490/in-rich-contentcreated_at=1627616044" width="13">。(简答题)

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出自：2024年国家开放大学答案

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