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Advanced Method of Projecting Manhole I/I Quantification for Specific Storm Events Improves Rehabilitation Prioritization Scoring Process

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Manholes represent a rather complex structure for assessing its structural condition and “leakiness” potential. Factors such as the assembly of components with multiple construction materials and exposure mechanisms to rainfall and runoff make computational scoring and I/I quantification logic complicated. Manholes have the potential to be significant sources of extraneous infiltration/inflow (I/I) but it is difficult converting visual inspections into I/I quantification. The American Society of Civil Engineers (ASCE) 2009 publication titled Manhole Inspection and Rehabilitation and other publications were used to develop an analysis tool for assigning infiltration/inflow (I/I) to standard manhole defects and projecting the I/I rates to vary with specific storm event rainfall frequency, intensity, and duration. The tool also adjusts the I/I rates depending the defect's component location and on which one of four rainfall runoff exposure mechanisms the manhole is exposed; sheet-flow, ponding/tributary limited, ponding/tributary un-limited, and elevated. The tool's I/I quantification process and development basis improves the engineering integrity of rehabilitation cost effective analysis and prioritization decisions.
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Keywords: Condition Assessment; Defects; I/I; I/I Quantification; Infiltration; Inflow; Manhole; Prioritization; SCREAMâ„¢; ehabilitation

Document Type: Research Article

Publication date: 2010-01-01

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