Detention Basin Retrofit: Optimization of Water Quality Improvement and Flood Control
Detention Basin Retrofit: Optimization of Water Quality Improvement and Flood Control
复制标题
滞留池改造：优化水质改善和防洪
DOI：
10.1061/40737(2004)43
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发表时间：
2004
影响因子：
2.2
通讯作者：
Qizhong Guo
中科院分区：
文献类型：
--
作者：
Keith B. Marcoon;Qizhong Guo
改造现有的雨水设施对于恢复受损流域至关重要。许多现有的雨水滞留盆地的设计仅仅是为了减少雨水径流峰值流量，或者没有按照现行的水质控制标准进行设计。这些盆地可以进行改造，以捕获额外数量的非点源污染物。本研究以新泽西州莫里斯镇的滞留盆地为例，展示了水质效益与改造导致的洪水问题增加之间的权衡。作为第一次改造的一部分，在现有大直径出口管的前面放置了一个底部有小直径圆形孔口、顶部有矩形堰的出口结构。在水力布线过程中，孔口的直径和堰的高度是变化的。确定的、小型的、不频繁的水质风暴的雨水滞留时间（污染物去除效率）的增加与全范围风暴的峰值流出率（洪水影响）的最大增加之间获得了定量关系。结果发现，超过特定堰高后，滞留时间不再增加，但最大峰值流出率大幅增加。还计算了不同孔口直径可实现的最长滞留时间。此外，还量化了不同水质风暴定义对可实现的滞留时间的影响。
Retrofitting existing stormwater facilities is of critical importance to restoring impaired watersheds. Many existing storm water detention basins were designed solely for stormwater runoff peak discharge magnitude abatement or were under-designed for current water quality control standards. These basins can be retrofitted to trap additional amounts of non-point source pollutants. This study analyzed a detention basin in Morris Township, NJ as an example to demonstrate the tradeoff between water quality benefits and increases in flooding problems resulting from retrofit. As part of the first retrofit, an outlet structure with a small-diameter circular orifice at the bottom and a rectangular weir on the top was placed in front of the existing large diameter outlet pipe. Diameter of the orifice and height of the weir were varied during hydraulic routing. Quantitative relationships were obtained between the increase in stormwater detention time (pollutant removal efficiency) for a defined, small, infrequent water quality storm and the maximum increase in peak outflow rate (flooding impact) for a full range of storms. It was found that beyond a specific weir height, the detention time no longer increased whereas the maximum peak outflow rate increased greatly. The longest detention time that could be achieved was also calculated for different orifice diameters. In addition, effect of different definitions of the water quality storm on the achievable detention time was quantified.