The rainwater design discharge,drainage flow and rainwater storage volume are analyzed and calculated,and the calculation method of rainwater storage volume is given.

Study on the influence of controlling pollution of the overflow from the initial rainwater storage tanks to Suzhou creek;

With use Of the experimental results of water quantity and water quality of some repre- sentative drainage systems overflow to Suzhou Creek in rainy days and treatment technology of the storage tanks the integrated model of hydrody- namics and water quality of rainfall-runoff about the drainage systems and river networks for SuZhou Creek is set up combined with physical model.

Measures are described for addition of the storage tank, revision of the operation modes and modeling computation, etc.

Hydraulic model for drainage system was used to hydraulically simulate the planning rainwater system in Shanghai EXPO area,and evaluate the long-term efficiency of initial rainwater detention tanks for controlling urban non-point pollution.

The Changping Pump Station was designed underground and integrated with the detention tank so as to make proper use of the underground space and coordinate with the surroundings.

Through measuring the processes of precipitation,discharge and pollutant concentration over 20 times from 2006 to 2008 in Chendulu combined sewerage system(CSS) along Suzhou Creek in central Shanghai,the environmental effects of Chendulu combined sewage detention tank(CSDT),the first running CSDT in China, were studied.