In SewerGEMS, you can assign sewer loads based on a variety of GIS-based sources such as customer water-use billing data, area-wide flow measurement, or polygons with known population or land use. Input and save an unlimited number of flow patterns, to accurately model flow changes over the course of a day. Load models with wet weather runoff flows derived from precipitation, using built-in rainfall distributions, or user-defined rainfall events. Runoff flows are modeled and calibrated using a choice of hydrograph methods, including RTK, SCS, Modified Rational, EPA-SWMM, or user-defined generic unit hydrographs. Users can also load the model based on property connections. Loading can be applied as user-defined hydrographs, pattern-based loads, and unit loads. Access and customize the comprehensive unit (dry weather) load engineering library with numerous typical unit loads based on population, area, count, and discharge.