Department of Biological and Agricultural Engineering, North Carolina State University, Raleigh, NC, USA.
Department of Crop and Soil Science, North Carolina State University, Raleigh, NC, USA.
J Environ Manage. 2020 Feb 1;255:109853. doi: 10.1016/j.jenvman.2019.109853. Epub 2019 Nov 21.
Dry detention basins (DDBs) are a type of stormwater control measure (SCM) designed to provide flood storage, peak discharge reduction, and some water quality improvement through sedimentation. DDBs are ubiquitous in the urban environment, but are expensive to maintain. In this study, two overgrown DDBs near Raleigh, NC, receiving highway runoff were monitored for up to one year to quantify their water quality and hydrologic performance. Both basins, B1 and B2, have not received vegetation maintenance since construction in 2007. Flow-weighted composite samples were collected during storm events and analyzed for nutrients (Total Phosphorus (TP), Ortho-phosphorus (OP), Ammonia-N (NH), NO-N (NO), and Total Kjeldahl Nitrogen (TKN)), total suspended solids (TSS), and total Cd, Cu, Pb, and Zn. An annual water balance was also conducted to quantify runoff volume reduction. Despite low influent concentrations from the highway, significant removal efficiencies were found for all constituents except NH in B1. TP, OP, NO, TSS, and Zn were reduced in B2. Both basins achieved greater than 41% volume reduction through soil infiltration and evapotranspiration, resulting in significant pollutant load reductions for all detected constituents, between 59% and 79% in B1 and 35% and 81% in B2. This study provides evidence that overgrown and unmaintained DDBs can reduce pollutant concentrations comparable to those reported for maintained DDBs, while reducing more volume than standard DDBs. Moreover, carbon sequestration likely increases while maintenance costs decrease.
干滞洪池（DDB）是一种雨水控制措施（SCM），旨在通过沉淀提供洪水储存、减少峰值排放和改善部分水质。DDB 在城市环境中无处不在，但维护成本高昂。本研究监测了北卡罗来纳州罗利附近两个长满杂草的 DDB，这些 DDB 接收高速公路径流，以量化其水质和水文性能。这两个盆地，B1 和 B2，自 2007 年建成以来一直没有进行植被维护。在风暴事件期间收集了加权流量复合样本，并分析了营养物质（总磷（TP）、正磷（OP）、氨氮（NH）、硝氮（NO）和总凯氏氮（TKN））、总悬浮固体（TSS）和总 Cd、Cu、Pb 和 Zn。还进行了年度水量平衡以量化径流体积减少。尽管来自高速公路的进水浓度较低，但在 B1 中发现除 NH 以外的所有成分都具有显著的去除效率。TP、OP、NO、TSS 和 Zn 在 B2 中减少。通过土壤渗透和蒸散，两个盆地的体积减少都超过了 41%，导致所有检测到的成分的污染物负荷显著减少，B1 为 59%至 79%，B2 为 35%至 81%。本研究提供了证据表明，长满杂草且未维护的 DDB 可以降低与维护 DDB 报告的可比的污染物浓度，同时减少比标准 DDB 更多的体积。此外，可能会增加碳封存，同时降低维护成本。
