The authors introduce the simplified hydraulic calculation formula of roof valley\'s overflow and set up the concerning tables,these may be useful for reference for designing roof rainwater drainage systems.

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.

Investigation of hydraulic model of pressure pipeline system for roof rainwater drainage;