Japan Platform for Redesign: Sustainable Infrastructure (JPRSI)

JPRSI Online Pavilion

Intrusion Detection Technology for Rainy Weather in Sewage

Technology / Service Summary

Although RII into sewer systems is one of the factors increasing the operational cost of public wastewater business, countermeasures against the infiltration have not been taken sufficiently due to its survey costs and the limited number of employees in wastewater operators. Therefore, we developed a new acoustic analysis method to be able to detect RII in a short period with low cost through focusing on sewer sounds, the sounds of running water in the sewer.


To detect RII into the separate sewer system for narrowing down deteriorated pipes.


This technology enables wastewater operators to detect RII in a wide range of sewer systems quickly. Commercial voice recorders are used to record sewer sounds.


This technology helps wastewater operators narrow down deteriorated sections of sewer systems quickly and reduce the survey costs by approximately 50% compared to the one in the conventional sewage inflow survey.

Controlled Substance

Applicable Regions / Countries

  • Japan
  • Southeast Asia
  • Oceania
  • Europe
  • ASEAN countries

    Indonesia,Cambodia,Singapore,Thailand,Philippines,Brunei Darussalam,Viet Nam,Malaysia,Myanmar,Lao PDR


Approximately 500 survey units have been adopted, and the results of the analysis have been evaluated in the B-DASH (Breakthrough by Dynamic Approach in Sewage High Technology) Project conducted by the Ministry of Land, Infrastructure, Transport and Tourism.

Related SDGs Goals

  • 3. Good Health and Well-being
  • 6. Clean Water and Sanitation
  • 9. Industry, Innovation and Infrastructure

Intrusion Detection Technology for Rainy Weather in Sewage