Tokyo Electric Power Co said sandbags were placed downstream to save radioactive substances from reaching the ocean, but rainwater may have caused the water in the ditch to overflow
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/fukushima-radiation-levels-rise-new-record-high-drainage-ditch
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/business-standard-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/japan
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/nuclear-power-plants
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/radiation
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/radioactive-waste
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/toxic-wastes
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/typhoons
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/hazardous-waste