The impact of stormwater drainage and detention ponds on flooding is assessed using statistical analysis and physically based computer simulation of a 45-year case study for a peri-urban catchment. In 1978, the 54 km² Ouseburn catchment in Newcastle upon Tyne was impacted by the connection of a new 2.1 km² residential development, directly to the Ouseburn River, via a stormwater drain, which reduced the time to peak and increased flood risk. Further residential developments of 1.6 km² have been built since 2004, again with separated sewer systems, but this time linked to stormwater detention ponds before draining into the Ouseburn River. Detailed analysis of the data, confirmed with computer simulation, shows that in contrast with the 1978 intervention, these new developments had only a minimal effect on the flows in the Ouseburn River, in fact achieving a small reduction in peak flows for large events. This study assesses the post-construction efficiency of such systems, and we show that the stormwater detention ponds are working as designed.

中文翻译：

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城市集水区的雨水蓄水池——英国泰恩河畔纽卡斯尔 Ouseburn 集水区池塘性能的分析和验证

使用统计分析和基于物理的计算机模拟对城市周边集水区 45 年的案例研究，评估雨水排放和滞留池对洪水的影响。1978 年，泰恩河畔纽卡斯尔54 公里^{2 的}Ouseburn 集水区受到了一个新的 2.1 公里²住宅开发项目的影响，该开发项目通过雨水排水管直接连接到 Ouseburn 河，从而缩短了高峰时间并增加了洪水风险。1.6 km ^{2 的}进一步住宅开发自 2004 年开始建造，再次采用分离的下水道系统，但这次在排入 Ouseburn 河之前与雨水滞留池相连。对数据的详细分析（经计算机模拟证实）表明，与 1978 年的干预相比，这些新发展对 Ouseburn 河的流量影响很小，实际上对大型事件的峰值流量略有减少。本研究评估了此类系统的建设后效率，我们表明雨水滞留池正在按设计工作。