The SWAT model is commonly used for the analysis of nonpoint source pollution. It includes modules for rainfall simulation, sink production, and diffusion of river water quality (Ding & Zheng 2004; Radcliffe & Cabrera 2006). Because of its pesticide/insecticide module and the agricultural management module, the SWAT model is often used to simulate agricultural nonpoint source pollution in basins and is rarely used for urban nonpoint source pollution studies. According to the ArcSWAT Interface for SWAT2009: User's Guide (Winchell 2012) and the SWAT Input/Output File Documentation Version 2009 (Arnold et al. 2011), it was found that the SWAT model for versions 2009 and above already has an urban database. The basin land use data and urban database have been improved, enabling the simulation of urban nonpoint source pollution in the basin with the SWAT model. The key parameters of the SWAT model urban database (Arnold et al. 2011; Abdelwahab et al. 2018) are shown in Table 1.