Interactive GIS Tools for Sewer Assessment, Sewer Rehabilitation, and I/I Reduction: Fid-Bau Portal

Interactive GIS Tools for Sewer Assessment, Sewer Rehabilitation, and I/I Reduction

Schroeder, John P. / Fallara, C. Timothy

CDM has been implementing sewer inspection, assessment and I/I studies for numerous national and international sewer collection system owners. CDM has developed several unique tools and procedures for assessment and rehabilitation of sanitary sewer systems. The goal of these programs are to identify locations and causes of sewer system hydraulic deficiencies, public and private sources of I/I, structural pipe defects, operation and maintenance (O&M) defects, and to provide conceptual designs to reduce I/I, improve the sewer system performance, and minimize basement flooding. The first tool is a unique custom-built GIS application that links CCTV inspection data in a PACP© database to a GIS pipes shapefile by way of a customizable interactive tree-like interface. This interface applies series of user-defined filtering queries to the data to classify pipes based on inspection results and other criteria. Outputs include prioritized recommendations for every pipe in the study areas. Each recommendation is also prioritized based upon the consequence of failure or blockage. The GIS tool efficiently processes digital CCTV video, sewer inspection data, hydraulic modeling data, resident complaint data, surface feature data, and costing data to produce prioritized structural and O&M sewer recommendations in a GIS mapping environment. The tool has been successfully applied to several national programs that are collecting large amounts of sewer inspection data in PACP© format. The development of the tool, the types of data that can be incorporated as well as examples of its use will be shown and discussed. The other GIS tool was developed and applied to all of the field investigation data to identify all the potential sources, locations and quantities of stormwater getting into the sanitary sewer known as inflow and infiltration. The GIS application organizes, queries and maps all of this data including flow monitoring data, dye testing results, hydraulic modeling data, residential complaint records, and surface feature data to determine areas that are highly susceptible to I/I to develop cost effective I/I reduction recommendations.