生物滞留措施排水系统设计方法研究

Study on Design of Drainage System with Bioretention Facilities

为有效设计生物滞留措施排水系统，通过对国外生物滞留措施设计手册的调研，结合国内排水系统的应用形式，对排水系统设置条件、材料、规格、布置形式、水量计算等分别进行了分析，讨论了各项排水设计参数的取值方法，以期为北京及国内其他城市生物滞留系统的排水设计提供参考。主要提出如下建议：排水管的适宜管材为PVC管，适宜管径为100—150mm，管径及开孔尺寸需保证排水层集料无法进入，以及满足土壤层最大入渗流量的要求。

In order to design a drainage system with bioretention facilities effectively, bioretention design manuals in foreign countries were investigated and drainage systems usually used in China were considered. The design condition, material, specification, layout and capacity calculation of drainage system were analyzed, and each drainage design parameter was discussed, which could provide reference for bioretention drainage design in Beijing and other cities. It was mainly concluded that the suitable drainage material was PVC pipe, and suitable pipe diameter was 100 to 150 ram, moreover, pipe diame- ter and its orifice size should make sure that the aggregate in the drainage layer and the maximum infiltration volume of the soil filter layer could be discharged.