Sewer Planning Basic Ordering Agreement

The Washington Suburban Sanitary Commission is seeking a contractor to provide professional engineering services for the Planning Division. The division is in the process of completing updates of the sewer basin models to all-pipes versions of the models. The contractor will be responsible for updating the sewer network information and recent flow meter data. The models are used to evaluate the capacity of the sewer system to convey existing and future dry and wet weather flows. • The models contain all gravity sewer pipes, force mains, and wastewater pumping stations in the sewer network. • The models are used to simulate wet weather conditions under 2-year and 10-year WSSC design storms. • Future flows are developed using demographic projections provided by the Metropolitan Washington Council of Governments (MWCOG). • The contractor will be working with the Planning Division to begin a new cycle of updates to the all-pipes sewer models.