基于径流污染控制目标为目的的分流制初期雨水调蓄池容积确定

鉴于初期雨水污染为地表水体的主要污染源之一,以儒乐湖初期雨水调蓄池容积确定为例,采用调蓄池工程措施进行截流,以V类水体标准为径流污染控制目标,在《室外排水设计规范》中控制径流污染的分流制初期雨水调蓄池计算公式的基础上,应用模型法模拟得出控制目标下的初期雨水径流累积深度及调蓄池容积。结果表明,截留径流累积深度为7mm,初期雨水调蓄池容积分别为9 250、5 850m^3时,研究区域内能够满足在管网重现期下排水水质达到V类水体标准。研究成果可为初期雨水截流工程实施提供建议及参考。

Determination of Volume of Initial Rainwater Storage Pool for the Diversion System Considering Control Objective of Runoff Pollution

The initial rainwater pollution becomes one of the main pollution sources of the surface water body. The storage tank engineering measures are adopted to intercept the flow. The V-type water body standard is taken as the runoff pollution control target. Based on the formula in design specification of outdoor drainage, the initial rainwater runoff accumulation depth and volume of storage pool under the control target is simulated by the model method. The results show that when the accumulated depth of intercepted runoff is 7 mm, the volumes of initial rainwater storage pool are 9 250 and 5 850 m3, respectively. The drainage water quality in the study area can meet the class V water standard under the return period of the pipe network. The research results can provide suggestions and references for the implementation of the initial rainwater closure project.