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An Integer Program for Optimizing Sanitary Sewer Rehabilitation Over a Planning Horizon
Author(s) -
Monsabert Sharon,
Ong Chee,
Thornton Paul
Publication year - 1999
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143096x122429
Subject(s) - sanitary sewer , schedule , rehabilitation , time horizon , pipeline transport , pipeline (software) , inflow , combined sewer , engineering , present value , sewage treatment , civil engineering , environmental engineering , computer science , mathematical optimization , business , mathematics , mechanical engineering , ecology , physics , finance , stormwater , neuroscience , mechanics , surface runoff , biology , operating system
Inflow and infiltration (I/I) associated with sanitary sewer pipeline and manhole defects have been known to cause unnecessary treatment expenditures. It is estimated that 10% or more of treated wastewater sources can be attributed to extraneous I/I. This paper documents an optimization model that analyzed costs and benefits of reducing the amount of I/I through selected rehabilitation methods recommended following a closed‐circuit TV inspection over a 20‐year planning horizon. An integer program was formulated using the General Algebraic Modeling System to optimize the sewer rehabilitation schedule and present value costs of repairs and I/I treatment. Results of a detailed analysis and the optimal rehabilitation schedule for a subshed of the Little Huntington Creek sewer system in Fairfax County, Virginia, are presented.