Downscale methodology for determining priority orders of the sewer rehabilitation

Tae Jin Kim, Joong Hoon Kim

Research output: Contribution to journalArticlepeer-review


Although inflow/infiltration (I/I) is one of the main factors used to decrease efficiency in sewer capacity and wastewater treatment, due to budget constraints, it is sampled only at the outlet point. Accordingly, the rehabilitation orders of defected sewers are determined for each drainage area without the consideration of I/I in each sewer. This study focuses on the development of a sampled I/I distribution (I2D) model and adecision-making model for sewer rehabilitation. The I2D model is developed based on theunit sewer defect value. The decision making model, developed using a genetic algorithm, is simulated with the consideration of sewer rehabilitation, wastewater treatment cost, and distributed I/I amount in each sewer on the budget. When the simulation results are compared with those of a numerical weighting method, it is concluded that the integrated model provides a detailed and systematic sewer rehabilitation plan from watershed-scale drainage areas to field-scale drainage areas.

Original languageEnglish
Pages (from-to)843-854
Number of pages12
JournalWater Environment Research
Issue number9
Publication statusPublished - 2013 Sept


  • Defects
  • Genetic algorithm
  • Inflow/infiltration
  • Optimization: SWMM

ASJC Scopus subject areas

  • Environmental Chemistry
  • Ecological Modelling
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution


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