The CWSID Sanitary Sewer System Evaluation Study included the creation of a GIS-based sewer system master plan and inventory program for the 47 miles of sewer trunkline and other system conveyance and collection facilities of CWSID. The inventory is an electronic database linked to an electronic map of all the District facilities. With this electronic inventory a management strategy was also created to facilitate maintenance and improvement activities of CWSID. As part of the study a hydraulic model was created from the database to simulate hydraulic operations of the collection and conveyance system, which included six pump stations and various diversions and inverted siphons. The hydraulic model results, which were linked to the GIS inventory and map, were used to determine needed improvements for the system at present and projected future discharges.