Storm sewer systems are typically designed and constructed for smaller, more frequent storms. Runoff from large, less frequent events is usually not entirely conveyed by storm sewers; rather, it flows over the land surface in roadways and in natural and constructed open channels. Therefore storm sewer conveyance networks and surface gutter drainage and conveyance networks are integrated into a whole urban storm sewer infrastructure system. CivilStorm CONNECT is capable of modeling a complete integrated subsurface storm sewer and surface gutter (channel) drainage system.