Through the analysis and measuring of the water quality of roof rain-runoff in Handan city,it is found that the water quality of roof rain-runoff is polluted seriously.

Quality monitoring and methods of treatment and utilization of the roof rainwater in Shanghai;

Analysis on Water Quality of Roof Rainwater Utilization in Dalian;

On the basis of the previous research, the quantity and quality of roof rainwater and the characteristics of building gray water system are analyzed in this paper.

According to the investigation of roof runoff quality in Shanghai,the quality of three main kinds roof runoff were presented in this paper.

Based on analysis of roof runoff quality in Shanghai,the treatment efficiency by sedimentation and filtration was investigated.

Based on the monitoring the urban roof runoff quality in Shanghai cultural and educational area during 2003～2006,the variations of pollutants concentrations were analyzed,and then the characteristics of roof runoff quality and the influential factors were studied by statistical methods.

Preliminary investigation on characterization of urban roof runoff in Macau;

Roof runoff water quality was affected by rainfall,rainfall intensity,roof material,season and air temperature.

Roof runoff is an important source of the diffuse pollution; therefore roof runoff pollution becomes the significant source of urban diffuse pollution.

According to the water quantity balance equation,the rainfall and evaporation from the surface of the lake is analyzed,seepage quantity from vertical and horizontal sides of the lake is calculated with Darcy s Law,and the rain runoff discharging into Mengze Lake from the surrounding area is calculated also.