High Level Sewer

Roslindale, MA

The High Level Sewer (HLS) is a masonry conduit built around 1901. Following a large rainstorm, the HLS developed internal pressure which caused water to overflow through the manholes and flood parts of the Roslindale neighborhood. SGH was retained to perform an emergency condition assessment and risk evaluation. We reviewed available data from the time of the HLS construction, performed a manned internal inspection, inspected the exterior, performed brick and mortar testing and petrographic observations, and evaluated rainfall and MWRA hydraulic analysis. We performed a soil-structure interaction analysis to determine the limiting internal pressures and the risk associated with pressurization of the HLS. We identified two areas that needed emergency repairs, prepared design and bid documents, hired the contractor performed bid evaluations, and monitored construction.

Service Provided:
Rehabilitation

Supporting Capabilities:
Construction Engineering