老城区排水系统溢流调蓄池容积计算方法

Calculation Method of Overflow Storage Tank Volume of Drainage System in Old Urban Area

老城区排水系统现状和近期以合流制为主,部分城区远期雨污分流后以分流制为主。为了控制合流制排水系统溢流污染,调蓄池是一项重要的工程措施。以武汉老城区CB小流域为例,对武汉城区的降雨资料进行分析,得出武汉城区降雨量与降雨强度的关系,推导出CB小流域合流制排水系统的截流倍数与溢流外排量之间的关系,并参考远期控制径流污染所需的调蓄池有效容积,进而得到CB小流域合流制排水系统溢流调蓄池的推荐有效容积。

The drainage system in the old urban areas is dominated by the combined drainage system in the current situation and the short term.The separation system will be mainly in some urban areas after the rainwater and sewage are separated in the long term.In order to control the overflow pollution of the combined drainage system,the storage tank is an important engineering measure.Taking the CB small watershed in the old urban areas of Wuhan as an example,the rainfall data in the urban areas of Wuhan is analyzed,and the relationship between the rainfall flow and rainfall intensity in the urban areas of Wuhan is obtained.And the relationship between the interception ratio and overflow out-discharge of the combined drainage system in the CB small watershed.Referring to the effective volume of the storage tank required for the control of runoff pollution in the long term,the recommended effective volume of the overflow storage tank of combined drainage system in the CB small watershed is obtained.