2009.4-2010.3 Yearbook of NILIM
Research Summary
Water Quality Control Department
| Reference Number | Y090202 |
| Title | Research on Characteristics and Prevention of Sewer Sinkholes |
| Start-End Date | 2007.4-2010.3 |
| Division | Wastewater System Division |
| Author | Head, Yosuke MATSUMIYA Senior Researcher, Toshiaki YOSHIDA Researcher, Wataru FUKATANI Researcher, Yasuo FUKUDA |
| Summary | In Japan, sewer networks have been installed extensively for the last several decades. They are aging and cause problems such as sewer sinkholes. In this research, characteristics and prevention measures were studied by national survey to sewer municipal operators. It was found that house connection laterals are blamed most. A risk evaluation method by combination of AHP and statisitcial analysis was developed. |