St. Charles Sanitary Sewer System Hydraulic Model

Location: St. Charles County, Mo.

Client: Public Water Supply District No. 2

Public Water Supply District (PWSD) No. 2 of St. Charles County retained Burns & McDonnell to develop a geographic information system (GIS) to manage its water and sewer system infrastructure. A sanitary sewer system hydraulic model was developed based on the GIS to define problem areas and evaluate solutions. Burns & McDonnell evaluated several modeling software packages and recommended that InfoSewer Suite Pro 6.0 be purchased by PWSD No. 2 for modeling the sewer system. The sanitary sewer system that was modeled includes the Lake Saint Louis area. The collection system has approximately 7,000 to 8,000 sewer connections, nearly 3,000 manholes, more than 100 miles of gravity sewer and force main, as well as three major pump stations and several minor pump stations. Most of the sewers are 8-inch vitrified clay, with newer 8-inch PVC. The largest sewer is the 27-inch trunk. The backbone of the collection system was modeled, which generally consists of all collector and trunk sewers greater than 12 inches.