The Study On Confluence System Model And Its Application In Shahe River Of GZ

City drainage system is the infrastructure that guarantee the normal operation ofthe city life, it plays an important role on eliminating and reducing the c ity’s roadseeper, combining sewer overflow etc.,In morden city,it is a effective way to enhancethe city municipal foundation facilities construction and management by the design,reform,and management of the drainage network hydraulic model that assistin g thecity drainage system.Therefore, in this paper we’ll use InfoWorks CS hydraulicmodel software to establish the SH basin combined hydraulic model of drainagesystem in GZ city, it would provide a guidance on design and management ofdrainage system for GZ and other cities from the practical level.This paper summarizes the research and application status of domestic andinternational city drainage model; secondly,it introduces the combined sewer systemmathematical model and calculation module of InfoWorks model of CS software.Then,discuss in detail the process of the establishing and verification of SH Riverconfluence modele of GZ city,also evaluate the net sedimentation risk, main piperunning load conditions, drought relief and water infiltrationand, on this basis, itanalysises the existing problems in the network system, and puts forwardoptimization solution measures on overflow and flooding objects.Finally, on the basis of the established and accurate combined sewer systemmodule, it discusses the changes of the sediment thickness’s impact on conflencemodel, analysises the influence of underlying surface runoff coefficient on combinedmodel by orthogonal experiment.The research results show that:when the thickness ofsediments increase to5%,10%,15%,20%,25%the water level average growth rate is13.8%,16.7%,18.8%,19.6%and19.5%respectively, when they are in three differentworking condition. While the three underlying surface of watershed impact onconfluent model ranging from strong to week: pavement, housing, roads.when therunoff coefficient were0.4,0.7,0.6, the total volume of runoff,and the flow of thepeak reach to the lowest.