Date of Award

Summer 1993

Document Type


Degree Name

Master of Science (MS)


Engineering Management & Systems Engineering


Engineering Management

Committee Director

Derya A. Jacobs

Committee Member

Billie M. Reed

Committee Member

Frederick Steier

Call Number for Print

Special Collections LD4331.E555N53


The purpose of this thesis was to study and analyze the wastewater pipeline failure risk assessment process, and then design and develop an effective and efficient wastewater pipeline risk assessment tool for the Hampton Roads Sanitation District, in Virginia, U.S.A. A knowledge based system was developed using an expert system building shell (Xi-Plus).

The system design is based on the knowledge elicited from the experts and literature in sanitary pipeline failure risk evaluation. The knowledge base contains both heuristics and procedural rules. The system interprets the information provided by the user and reasons from that information to reach conclusions on wastewater pipeline section failure risk. Based on risk, the section is ranked relative to other pipeline sections. By using the system, HRSD decisions on pipeline segments replacements and rehabilitation alternatives can be made based on the rankings.


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