Sanitary Engineering Services, Patapsco Sewershed, Task D, G, H. Baltimore County, Maryland.

WRA established a sewer system metering program for the Patapsco Sewershed using 28 temporary flow meters that were maintained for a period of nine months. Results from the flow metering were used to complete the I/I analysis and calibrate the hydraulic model. The model was populated by importing the County’s GIS and verified with field investigations and survey data. Using the results of the I/I analysis and the calibrated hydraulic model, WR&A prepared Long term Capacity/Peak Flow Management Reports. Using the results of the field investigations, CCTV and manhole inspection review, and the hydraulic analysis/modeling, a Sewershed Repair, Replacement and Rehabilitation (SRRR) Plan was developed to document the complete hydraulic and structural improvements necessary to prevent the occurrence of model predicted SSOs under a full range of design storm events in accordance with the County’s Consent Decree.