Barr Engineering Company, 4700 West 77th St., Suite 200, Minneapolis, MN 55435, USA.
Water Res. 2011 Nov 15;45(18):5895-904. doi: 10.1016/j.watres.2011.08.043. Epub 2011 Sep 12.
Standard sumps (manholes) provide a location for pipe junctions and maintenance access in stormwater drainage systems. Standard sumps can also remove sand and silt particles from stormwater, but have a high propensity for washout of the collected sediment. With appropriate maintenance these sumps may qualify as a stormwater best management practice (BMP) device for the removal of suspended sediment from stormwater runoff. To decrease the maintenance frequency and prevent standard sumps from becoming a source of suspended sediment under high flow conditions, a porous baffle, named the SAFL Baffle, has been designed and tested as a retrofit to the sump. Multiple configurations with varying percent open area and different angles of attack were evaluated in scale models. An optimum configuration was then constructed at the prototype scale and evaluated for both removal efficiency and washout. Results obtained with the retrofit indicate that with the right baffle dimensions and porosity, sediment washout from the sump at high flow rates can be almost eliminated, and removal efficiency can be significantly increased at low flow rates. Removal efficiency and washout functions have been developed for standard sumps retrofitted with the SAFL Baffle. The results of this research provide a new, versatile stormwater treatment device and implemented new washout and removal efficiency testing procedures that will improve research and development of stormwater treatment devices.
标准集水井（人孔）为雨水排水系统中的管道接头和维护提供了一个位置。标准集水井还可以从雨水中去除沙和淤泥颗粒，但有很高的被冲出收集沉积物的倾向。通过适当的维护，这些集水井可能有资格成为雨水最佳管理实践（BMP）设备，用于从雨水径流中去除悬浮泥沙。为了减少维护频率并防止标准集水井在高流量条件下成为悬浮泥沙的来源，设计并测试了一种多孔挡板，称为 SAFL 挡板，作为集水井的改造。在比例模型中评估了具有不同开口面积百分比和不同迎角的多种配置。然后在原型尺度上构建了一个最佳配置，并评估了去除效率和冲洗效果。改造后的结果表明，通过正确的挡板尺寸和孔隙率，可以几乎消除集水井在高流速下的泥沙冲刷，并且在低流速下可以显著提高去除效率。已经为配备有 SAFL 挡板的标准集水井开发了去除效率和冲洗功能。该研究的结果提供了一种新的、通用的雨水处理装置，并实施了新的冲洗和去除效率测试程序，这将改进雨水处理装置的研究和开发。
