Modeling Approach using PCSWMM to Support Infiltration/Inflow Remediation Area Studies

Abstract

Launching a series of sewer system inflow and infiltration (I/I) remediation projects, the City of Columbus, Ohio structured the project schedules so that the first I/I project would set the technical approach "cornerstone" of the projects to follow. In particular, it was important that the initial project develop a set of modeling tools and application approaches designed to streamline all the hydrologic and hydraulic (H/H) models and provide a consistent approach for the entire series of projects.The first I/I project is known as the Livingston/James Sewer System I/I Remediation Project. To ensure consistency and compatibility, the City established PCSWMM as the platform for all the City's I/I remediation projects. In developing the modeling approach for the first project, the City of Columbus, CDM Inc., and CHI worked together as a team to enhance and apply PCSWMM and the SWMM 4.4h computational engine to model the subject sewer system. This chapter discusses the lessons learned and the solutions that the project team developed, including several SWMM code revisions and the development of new PCSWMM routines. Each of these solutions represents valuable developments potentially applicable to other PCSWMM modeling projects.

Identifying Wet-Weather Sanitary System Problems by Combining Field Investigations with Computer Modeling

“…Then the model was applied to different design alternatives assuming that the system remains clean (Manning's n = 0.013). McGill et al (2006) described the model development in detail and Cheng et. al (2007) demonstrated the model calibration approach on how sewer inspection data were integrated into the calibration process to improve reliability and costeffectiveness.…”