What should a country do when a river carries more water than before? One answer is to build a higher wall. The Netherlands is trying something different: give the river more space. According to Rijkswaterstaat, the Dutch government created the Room for the River program to reduce flood risk by allowing rivers to spread into carefully planned areas. The idea sounds simple, but it changes the question. Instead of asking only, "How can we keep water out?" engineers also ask, "Where can water safely go?" In a floodplain, land beside a river can temporarily hold extra water. If the water level rises, that open space takes some pressure away from dikes and from towns behind them.
Listening practice: Why the Netherlands gives rivers more room
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本期内容
荷兰的「Room for the River」项目没有把防洪理解成一味加高堤坝,而是在河流沿线预留可以暂时进水的空间。荷兰公共工程与水管理部门 Rijkswaterstaat 介绍,项目在荷兰三十个地点采取了内移堤坝、开挖分洪道、降低河漫滩等措施;高水位到来时,这些区域可以暂时分担河道和堤坝的压力。1
本期还讲到 IJsseldelta 的分洪道:它位于两道堤坝之间,高水位时充水,让河流多一条通道。这样做并不等于消除洪水,而是提前决定水可以安全地流向哪里。Deltares 的研究显示,恢复河漫滩还可能带来动物栖息地、碳储存和休闲空间,但这会和河漫滩农业用地发生取舍。2 UNESCO 对欧洲相关实践的概括也很直接:给河流留出自然涨水的空间,不能只靠不断加高堤坝或把河道压得更窄。3
听法提示
第一遍只抓三个问题:河流为什么需要额外空间?荷兰具体改变了哪些地方?这些改变带来了什么取舍?第二遍重点回听 floodplain、flood channel、relieve pressure 和 trade-off。不必第一次就记住所有地名,先听懂「让水有地方去」这条主线。
References
- 1Room for the River
rijkswaterstaat.nl
- 2
- 3Finding heritage-based fixes for floods
unesco.org
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