Hello Shankar, There is tool in SewerGEMS Connect Edition called catchment delineation, which creates catchments for you automatically using catch basins as outflow node with the help of Terrain model. To use this tool you need terrain model, apply that in SewerGEMS and then use trace downstream and catchment delineation tool. Read more about catchment delineation using link mentioned below. Using Catchment Delineation If you have predefined catchment area and you want to divide that into multiple areas then you can use above mentioned method, if you are not happy with the results, then you can use Microstation or AutoCAD integrated mode of SewerGEMS and then create catchments using CAD tools which will save your time than doing it in standalone mode.
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