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Solving the Private I/I Quandary with Creative Field Investigations

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Sanitary sewer evaluation surveys (SSES) and inflow/infiltration (I/I) investigations are not new. However, many previous studies have fallen significantly short of fully understanding where, why, how, and how much stormwater inflow and infiltration is entering the sanitary sewer system. CDM is currently working on two large-scale I/I studies for the city of Columbus, Ohio. CDM's approach is unique because detailed thorough field investigations are combined with creative engineering analyses and geographic information system (GIS) implementation. Some of the essential field investigations and engineering analyses include:

Flow monitoring of sanitary sewers

Hydrologic/Hydraulic modeling

RTK shape analyses of flow monitoring data for each sub-basin

Private property questionnaires mailed to all residents, and compiled and entered into a database

Dry and wet weather CCTV inspections with PACP comprehensive database

House-to-house, street, and alley inspections/surveys to identify potential I/I sources from area drains, manholes, and foundation drains

Dye-testing of private property and public property

GIS mapping and database compilation

Alternative development and cost estimating

The paper and presentation will detail the most critical and innovative methodologies, such as the use of hand-held GPS data loggers, to complete private property inspections in the study area. These methodologies identify the paths of stormwater and the efficiency of stormwater flows to the storm sewers or sanitary sewers from downspouts, sump pumps, and foundation drains.

Keywords: CCTV; GIS; PACP assessment; alternative development; data analysis & implementation

Document Type: Research Article


Publication date: January 1, 2010

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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