Project Spotlight: Richmond Sanitary District CSO LTCP Hydraulic Modeling

The Richmond Sanitary District (RSD) is currently implementing its Combined Sewer Overflow (CSO) Long-Term Control Plan (LTCP). As a part of the CSO LTCP, the RSD has constructed many collection system improvement projects in the past two decades. To ensure that these improvement projects meet the goals and performance requirements of the CSOP LTCP, the RSD has performed extensive preliminary engineering and hydraulic modeling.

The RSD is currently preparing for its final CSO LTCP projects. As a part of that effort, a significant hydraulic modeling effort has been completed.  Twenty (20) temporary area-velocity flow meters were placed in key locations of the collection system for approximately eighteen (18) months.  The flow meter data was utilized to update the RSD’s hydraulic collection system model. Modeling indicates that the RSD is on track with their CSO LTCP and all collection system improvement projects are operating as intended. In fact, the RSD recently experienced a 10-yr 1-hr storm, and the performance of the hydraulic model matched the flow metering data with a high degree of accuracy.

For more information regarding the success of the Richmond Sanitary District’s CSO LTCP, collection system improvement projects, and hydraulic modeling, please contact Brian Wilson, PE – Associate and Project Manager.